Aiko Hatayama/Relationships

Hajime Nagumo
At first, she regarded Hajime as one of the students she had to take care of and, like Kaori, respected Hajime for his immense kindness. After his apparent death, Aiko was so shocked that she passed out, feeling great remorse and responsibility for him, and doing everything she can to protect her surviving students, even using herself as Leverage. When they reunited in the Lakeshore Town of Ur, Aiko was extremely relieved to know that Hajime had survived, but was dismayed while he was accompanied by two beautiful women Yue and Shea who claimed to be lovers of Hajime, mistaking the fact that Hajime was too busy with womanizing to return. Aiko was shocked by Hajime's new cold, ruthless and unforgiving personality such as his complete refusal to aid the Kingdom of Heiligh for the sake of his classmates and his teacher and also threatened to kill Chase for attempting to steal his gun. Aiko was deeply saddened that Hajime had completely changed from his old self, but was relieved that he had new friends that he could count on. Hajime had always respected Aiko for her dedication to her students as a teacher, and had therefore chosen to tell Aiko the real reason for his refusal to join them by telling her what he had learned from Oscar Orcus about Ehit's true nature and how he had summoned all of them to Tortus as pawns in his mad death game, knowing that being one of her students himself Aiko will certainly believe his words. Later after Hajime had killed Shimizu, knowing what he has that done for her, she became aware of him as a member of the opposite sex. Later Aiko is extremely worried when Ishtar and Eliheid SB Heiligh called Hajime a heretic for his absolute refusal to obey them, so Aiko desperately tried to convince them to change their mind, but to no avail. Fearing that Kouki and her other students might start attacking Hajime at the instigation of the Holy Church and the Kingdom of Heiligh, Aiko decides to warn her students of the true nature of Ehit, by asking Shizuku to gather them all together to dinner time so she can tell them what she has learned from Hajime, but was kidnapped by Noint before she could do so. Later she and Tio destroyed the Holy Crurch because she don't want Hajime to die. She later accepts that she loves him, although she is still troubled by the fact that she is older and his teacher. However, Hajime later pointed out both of her problems are meaningless, as he will stop being her student after he graduates from high school and their age difference is pretty pointless considering how much older Yue and Tio are in comparison.

Kaori Shirasaki
As one of her students, Aiko also dearly care for Kaori, and was close enough to exchange communication letters with each other while in Tortus. Aiko is also aware of Kaori's love for Hajime, which drives her determination to find him in the Great Orcus Dungeon and was shocked to learn that Kaori had been the reason why Hiyama had tried to kill Hajime in the first place and how Kaori would be in danger in being the target of Hiyama's crazed lust. Despite wishing it was just a misunderstanding, Aiko's fears were later proven when Hiyama actually killed Kaori to make her his undead slave, showing great concern for Kaori, thus Aiko did not blame Hajime for murdering Hiyama.

Yue
Yue is Hajime's companion, lover, and later first wife. During when Hajime reunites with Aiko at Ur, Yue is annoyed at Aiko due to her constant attempts to get Hajime to explain what had happened to him after his apparent death. She also grows jealous of how close Aiko appears to be with Hajime as her teacher, as well has her words having an impact on him with regards to wanting him to find happiness by fighting for more than just himself. While Yue is unsettled with Aiko at first, she also finds her somewhat adorable and constantly mentally compares her to a small animal. Before the battle of Ur, Yue takes Aiko to her room at the town's inn and expresses her gratitude for helping Hajime by telling him to live for the sake of others, while at the same time revealing the full extent of her relationship with Hajime by explaining that the two of them already had sex, much to Aiko's shock.

Shea Haulia
She is one of Hajime's wives. After the battle of Ur, Shea risked her life to save Aiko when she was about to be killed by the demon Reiss due to her being Hajime's precious teacher.

Shizuku Yaegashi
Likewise with Kaori, Aiko also shares a close friendship with Shizuku, one of her students, as she is the only one Aiko would discuss her thoughts and worries with. Aiko also trusted Shizuku enough to asked her to gather her classmates in to order to reveal what Hajime learned about Ehit. While Shizuku also care dearly about Aiko but was dismayed to learn she had fallen for Hajime as well.

Tio Klarus
She and Tio destroyed the Holy Church and the Pope for intervering with Hajime fight with Noint.

Myu
She is Hajime's adopted daughter.

David Zahler
He is a Templar knight of the Holy Church and is in charge of Aiko's bodyguards while she roams the kingdom to use her powers to aid in improving its agriculture. At first, he and the other knights attempted to seduce her in order to make her more loyal to the Holy Church, but they are moved by her kindness and have started being loyal and submissive to her. After learning that Aiko is partially responsible for destroying the Holy Church's Divine Temple and killing Pope Ishtar Langbard, David and the other guards forgive her due to all they had learned from following her. He is now a devoted follower of Aiko and the new religion that is based off her new title as the "Fertility Goddess".

Yuka Sonobe
One of Aiko's students. Yuka cares greatly for Aiko well-being and offers to be her bodyguard while traveling the Heiligh Kingdom.

Taichi Furukawa
Aiko's childhood friend. The two had a brother-sister relationship, but Taichi begins to develop feelings for her and finally confesses his love for her after she returns to Earth. Aiko could not respond to his feelings since she has chosen to be with Hajime. That puts a strain on their relationship, but Aiko is convinced that they will be friends again someday.

Other Students
Having resolved to be like her former teacher, Aiko cares immensely about the safety of her students to the point that she was willing to threaten the King and the Pope after they tried to force her students to continue training after Hajime fell into the Abyss. Despite Shimizu and Hiyama's respective atrocities, Aiko had still wished they could live to make amend for their actions. Aiko's devotion to her students along with her childlike cuteness makes her extremely popular with her students, nearly on pair with Kouki, Kaori and Shizuku's popularity. When Aiko was mysteriously abducted by Noint and imprisoned in highest floor of the Holy Church in the Divine Mountain, Shizuku, Yuka and her closest friends desparately searched for her non-stop and was prepared to personally climbed the Divine Mountain to find her if they had to showing how much they reciprocate her devotion. However, not all of Aiko's students reciporate her care as when Shimizu was even on verge of death had felt absolutely no remorse for trying to kill Aiko. Eri and Hiyama even exploited Aiko's abduction by Noint as a great chance to realize their nefarious plans to kill their fellow classmates in a death trap and to murder and zombify Kouki and Kaori into their respective undead slaves. As Hajime expected, Aiko was able to convince all of his classmates of Ehit's true nature even Kouki despite his misguided sense of justice was forced to believed Aiko's words after Eri had exposed her true twisted evil nature and her schemes of betrayal including the fact that Aiko was in reality abducted by Noint.

Ehit
She at first was respectful to Ehit, but after learning the truth about Ehit by Hajime, she lost all respect for the evil god.

Noint
She was kidnapped by Noint before she could tell the students the truth about Ehit. She was later freed by Hajime from her prison cell.

Yukitoshi Shimizu
Yukitoshi Shimizu was Aiko's student. She cares for him like the rest. But Shimizu holds a hatred toward his teacher and his classmates and betrayed them in his attempted to be a true "hero". He took her hostage to force Hajime to give him all of his guns until hooded person shot both Aiko and Shimizu. Aiko begged Hajime to save Shimizu but mercilessly killed him due to him being beyond saving.

Daisuke Hiyama
Daisuke Hiyama was Aiko's former student for his bullying methods toward her other students and Hajime. Witnessing Hajime murdered Hiyama for his betrayal of temporarily murder on Kaori. and learning that Hiyama earlier attempted to kill Hajime once before in the Great Orcus Labyrinth, Aiko doesn't have a single trace of sympathy for Hiyama.

Eri Nakamura
Eri Nakamura was Aiko's former student who is also a traitor. Aiko once treated her student nicely. Eri, however, never cared of her teacher but attempted to kill her and her classmates due to her and the rest who stood in her way to make Kouki her boyfriend.

Ishtar Langbard
The pope of the Holy Church. Since they first met, Aiko had been at odds with the pope, who wanted her students to fight the demons in the name of Ehit while she wanted to get them back home. While Aiko tried to argue against him because she didn't want her students fighting in a war, he was able to convince Kouki, which resulted in the rest of her student agreeing to help them in their war. After Hajime fell into the Abyss and many of her students were traumatize, she took a firmer stance against Ishtar and the Holy Church when they still tried to convince them to fight, even using herself as leverage, which worked.