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.

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 before killing them. Eventually, Hajime does develop feelings for Kaori and accepts her as one of his lovers.

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.

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.

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. She has fallen in love with him after he saved her from Noint.

Liliana S. B. Heiligh
The Crown Princess of the Kingdom of Heiligh. She would fall for Hajime after he saved her from being raped 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

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 complicate do the latter being too doting towards his daughter. Most of the time, Tomoichi is hostile towards Hajime because he's dating Kaori yet has a harem. Hajime understands Tomoichi feelings on this well enough to admit he would feel the same way if something similar happened to 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 wife (Kaori and Kaoruko). Other times, Tomoichi is usually amazed or disturbed by Hajime's Artifact.

Kaoruko Shirasaki
Kaori's mother.

Yuka Sonobe
One of Hajime's classmates who was transported to Tortus. She develops feeling for Hajime after he saves her from a Behemoth attack during a training exercise in the Orcus dungeon.

Helina
Princess Liliana former personal maid. She now serves Hajime as the leader of the Fleur Knights combat maid group.

Kousuke Endou
He is one of Hajime's closest friends and he is considered as the 'Right-Hand of the Demon King'.

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. Although, Hajime ended up falling into the abyss when he tried to retreat due to Daisuke's attack, which devastated most of them.

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 recognising 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.