Hajime Nagumo/Relationships

Yue
Yue became Hajime's most important person after he fell into the Abyss. The two quickly grew close due to their similar backgrounds and similar circumstances. Even in public, they tend to go into their own "pink world" and ignore everything in their surroundings. Whenever there is danger Hajime and Yue always prioritize each other's safety. Even though Hajime is surrounded by women who want to be his lovers and Yue herself wants him to be intimate with her. He has never wavered. His reasoning being that he is a man who would never cheat on the woman he loves and wants to be monopolized by Yue since, if the situation was reversed, he would never want Yue to be with anyone but him. It is Hajime's wish to bring Yue and the other girls back to his world, as she and Kaori among his wives are the most closes to him.

Kaori Shirasaki
Hajime has always seen Kaori as a friend even though her attention brought him nothing but trouble. When Hajime began his travels he had decided to discard his former classmates after his transformation but the moment he heard Kaori was in trouble he went into a dungeon to save her to repay her kindness. In the end, Kaori decided to travel with him determined to win his affection despite his drastically different personality. While Hajime said he won't respond to her feelings because he was in a relationship with Yue, she refused to give up on winning him over. Hajime has proven that he does see Kaori as someone important in his life, becoming incredibly furious and brutal towards anyone who harmed her to the point where he will make them suffer horribly before killing them. After Kaori was killed, he became absolutely furious towards her killers, while at the same time, determined to revive her using spirit magic, putting it as his top priority at the time. Eventually, Hajime does develop feelings and love for Kaori after she comforted him at his loss for Yue, and accepts her as one of his lovers/wives, as she and Yue among his wives are the closest to him.

Shea Haulia
During their first meeting, Hajime's impression of Shea was bad due to her excessive clingy attitude. Hajime wouldn't allow Shea to travel with him until she became strong so she trained with Yue so that one day she could stand next to them in battle. As time passed Hajime and Yue began to see Shea as part of their family but to Shea's and shockingly Yue's great disappointment Hajime could not see Shea in a romantic light. However, that began to change when Hajime realized that Shea is just as important and irreplaceable to him as Yue and has begun to show his previously hidden feelings for her. Without realizing it the two have created their own "pink world" while they are alone.

While Hajime has come to respect Shea for how far she's come, he does miss the old useless Shea, feeling nostalgic when he does.

Tio Klarus
After defeating and arguably "tainting" her, Hajime has been followed by the masochistic and incredibly perverted Tio who refers to him as her "master". Hajime constantly finds himself punishing her for her various misdeeds during their travels which makes Tio incredibly happy and disgusts everyone else. During their fight against Freid Bagwa, Tio admitted her true love for Hajime before escaping per his orders. Since then, Hajime has become "slightly" more tolerant of her and sees Tio as a member of their group, even going so far as to trust her with Myu's safety while he and the others went into a dungeon. Hajime later confesses that he loves her when her grandfather and the rest of the dragon race decide to help him wage war on Ehit. While Hajime's treatment and feelings have improved, he still doesn't hesitant to punish Tio like before, both out of affection and annoyance.

Shizuku Yaegashi
Hajime cannot handle Shizuku for she knows his secrets such as middle school stuff. After the trials in the true Haltina woods, Shizuku couldn't stop thinking about Hajime. Shizuku later admits to him that she has feelings for him. Hajime has always had a positive opinion of Shizuku because she always helped him out before they were summoned to Tortus and didn't cause him any trouble, unlike Kaori. Even after his transformation, he still spoke with her more nicely compared to the rest of his classmates and willing helped her out on many occasions, including giving her a new enchanted sword that works better for her fighting style and consoling her after Kaori's death. The way he got along with Shizuku caused Yue to see her (Shizuku) as "the last boss", who she and Kaori might have to go up against for Hajime feelings.

Aiko Hatayama
His homeroom teacher who was transported to Tortus along with her students. At first, she thinks of him as one of the students that she cares for. She feels very responsible for his apparently death and does whatever she can to protect her students, even using herself as a bargaining chip. Later, after Hajime had killed Shimizu, knowing that he had done it for her sake, she becomes conscious of him as a member of the opposite sex. She later comes to accept that she loves him after he saved her from Noint, although she's still troubled with the fact that she is older and his teacher.

Liliana S. B. Heiligh
The Crown Princess of the Heiligh Kingdom. She would fall for Hajime after he saved her from being sexually assaulted by her former fiance Crown Prince Baius.

Myu
Hajime and Shea saved her from a sewage system after she escaped from slavers. Myu immediately bonded with them and began to call them "Onii-chan" and "Onee-chan". Later on, after Hajime and co. once again saved her from slavery she began calling him "Papa" much to Hajime's chagrin. As they travelled together Hajime began acting more and more like her father, from being incredibly overprotective to scolding and subsequently comforting her when she put herself in danger. After returning Myu to her mother, Remia, who started referring to Hajime as her husband, Hajime decided to take them with him once he returns to his world which both mother and daughter happily agreed to.

Remia
Myu's Mother she is one of Hajime's wives. Remia see Hajime as a savior and a father figure for her daughter while falling in love with him as time progress. She even addresses him as "dear" several times when talking to him and enjoys acting as his wife while they are together.

Cam Haulia
He is loyal to Hajime.

Lundel S. B. Heiligh
Liliana's younger brother and the Crown Prince of the Kingdom of Heiligh.

Tomoichi Shirasaki
Kaori's father. Hajime relationship with Tomoichi can best be described as complicated due to the latter being too doting towards his daughter. Most of the time, Tomoichi is hostile towards Hajime because he's dating Kaori, while also having a harem. Hajime understands Tomoichi's feelings on this well enough to admit he would feel the same way if something similar happened to his own daughter Myu. At the same time, Tomoichi is grateful to Hajime for protecting his daughter and bringing her home, something he's willing to admit. There are also times where Tomoichi can sympathize with Hajime when it comes to being a father and is willing to lend his experience to him, such as when it comes to dealing with an angry daughter or being confined by their respected wives (Kaori and Kaoruko). Other times, Tomoichi is usually amazed or disturbed by Hajime's artifacts.

Kaoruko Shirasaki
Kaori's mother. She is more openly supportive of Kaori's relationship with Hajime than her husband.

Yuka Sonobe
Yuka is one of Hajime's classmates who was transported to Tortus. Yuka is grateful to Hajime for saving her life in the Great Orcus Labyrinth from the Traum Soldiers and wishes to pay him back. She is shown to have a crush on him as time passes. The two of them get along to the point that most of the other students in her class call her his 'Mistress' (though they both deny any romantic involvement between each other). Hajime has admitted he trusts Yuka and feels comfortable talking to her about his problems.

Roze Phiris Avenst
Roze is the queen of another world. She is amazed at Hajime's powers and initially mistakes him to be the "Dragon Knight" that she hears from stories of her childhood. After getting to know Hajime and seeing how he mercilessly treats his enemies, Roze now views him as a demon god, but still holds him in high regard. It is implied that she has romantic feelings towards Hajime.

Helina
Princess Liliana's former personal maid. She now serves Hajime as the leader of the Fleur Knights combat maid group. Helina is shown to treat Hajime as more of her master than even Liliana.

Kousuke Endou
He is one of Hajime's closest friends and he is considered as the 'Right-Hand of the Demon King'. Though Kousuke didn't used to have much interaction with him before the 'Summoning Incident', he was still affected by Hajime's supposed death in Great Orcus Labyrinth. But after learning that he was alive, and about his journey and how he overcame all the odds, Kousuke started to have respect towards him, especially after Hajime helped him rescue his friends who were ambushed in the Great Orcus Labyrinth. Later on, after the climactic battle, as Kousuke was entranced by Lana, he went on to ask her out repeatedly. After countless attempts, Lana gave him the condition of clearing a Great Labyrinth and landing one hit on their boss, a.k.a. Hajime, before she would consider going out with him. Kousuke managed to achieve both of them, and Hajime has since had respect for him. After the students return back to Japan, Kousuke becomes the only member of the Returnee's group who stays active and does various tasks for and with Hajime in order to protect and manage the safety of everyone close to them. Because of Lana's nature of wanting to gather 7 wives for Kousuke, and the fact that the "Abyss Lord" powers of Kousuke turned him into a, Hajime started to have a really close relationship with Kousuke and even considering him as a 'bosom friend'. Hajime also starts to egg Lana on her quest for a harem for Kousuke. This has resulted in many complicated situations for Kousuke, as result.

Riiman
Riiman is considered to be Hajime's first male friend since he was summoned to Tortus. The two of them instantly bonded when they first met at the aquarium where Riiman was being held.

Meld Loggins
The former Knight Commander of the Heiligh Kingdom that was entrusted with the responsible for overseeing the training of the summoned heroes from the other world. While Hajime wasn't as close to Meld as the frontliners of his class, he always respected the captain, even after his transformation. This make Meld one of the few adults in Tortus who Hajime truly respects and still still speaks highly him to this day. Hajime was willing to uses one of his Ambrosia to save Meld's life when he came to rescue him and the hero party at the Orcus dungeon, admitting he didn't want him to die. Meld on his part was grateful that Hajime saved him and the others, happy he survived and regretful he (Meld) failed to save him before.

Kouki Amanogawa
Hajime has a neutral standing about Kouki and ignores the fact that Kouki envies him. He only has a bit of good intent to Kouki because he is a close friend of Kaori. However, Hajime mostly considers Kouki to be a huge pain to deal with because of Kouki's bad habit of only believing what fits his worldview and annoying sense of justice. He even preferred not to have to explain things to Kouki because he knows he won't believe him since it makes little of what Kouki has done himself. Even though Hajime saved him and the rest of his classmates multiple times, Kouki still couldn't accept Hajime's way of living because it contradicts his own ideals. Hajime finds these complaints empty because Kouki keeps failing when it counts because he lacks resolve, usually leaving him to clean up after Kouki messes up.

Later in After Story, Kouki becomes friends with Hajime, though the latter refuses to say the same.

Classmates/Returnees
Hajime wasn't on good terms with most of his classmates due to him being an Otaku. The only classmates who were friends with him were Kaori (who had a crush since she first saw him) and Shizuku (being Kaori best friend). Unfortunately, Kaori liking him caused most of the guys in the class to be jealous of Hajime and some of them bullied him at some point, mainly Daisuke Hiyama and his friends. After they were summoned to Tortus, Hajime ended up having the lowest stats among them, causing almost everyone of them to call him incompetent. During the class training exercise in the Orcus dungeon, Hajime was the one who saved everyone by holding back the Behemoth long enough for them to get back, earning most of his classmates respect. Unfortunately, Hajime ended up falling into the abyss when he tried to retreat due to Daisuke's attack, which devastated most of them. It was seeing what happen to Hajime that caused most of them to become too scared to fight anymore.

However, Hajime survived the fall and decided to focus on his own goal and no longer cared about his classmates. When he reunited with them, he made a point to tell them they weren't his comrades and he would kill them if any of them became his enemy. His transformation shocked all them to the point where they had difficulty recognizing him at first and became terrified of him as well, especially those who bullied him in the past. Despite saying he doesn't care about them, he still found himself saving them when their paths crossed, which they were grateful for. Hajime was also willing to bring his classmates back to Japan when finishing clearing the Labyrinths.

In the After Story, Hajime's relationship with his classmates has improved greatly, thus they know better than to get on his nerves. All of them respect him for everything he has done for them and consider Hajime their leader, calling him the Demon King in a friendly manner. However, because they can only see Hajime as the Demon King they knew from Tortus, they find the sight of him going to school normally and using polite language towards the teachers as so unfitting they can barely keep themselves from laughing, no matter how many times they see it.

Koutaro Fukube
Koutaro has been in contact with Hajime for over a year as a member of the "Returnee Response Division", which is impressive by most standards since his predecessors could not even handle his job for three months. He is extremely scared of Hajime and always takes stomach medication at even the slightest gesture that is made by the demon king. Hajime feels bad that he has inadvertently caused Koutaro to feel so much stress, but views him as a highly competent public servant.