Kousuke Endou/Relationships

Eiji Endou
Kousuke's father who works at the City Hall's Population Department. He tends to forget Kousuke's existence sometimes and worries about his younger son's future.

Misato Endou
Kousuke's mother who works at the City Hall's Municipal Tax Department. She tends to forget Kousuke's existence sometimes and worries about her younger son's future.

Sousuke Endou
Kousuke's older brother and a university student. He is jealous that his younger brother had managed to get a girlfriend and is on his way to even getting a harem while he has a history of not having a girlfriend equal to his age.

Manami Endou
Kousuke's younger sister, a middle school student, and a member of the Soul Sisters. She is sort of an otaku and is really excited at the aspect of his older brother getting a harem. She is, however, conflicted that Kousuke works for Hajime, who is the Soul Sisters' sworn enemy and bully.

Ehit
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Unknown
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MOTHER (A.I.)
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Jugo Nagayama
One of Kousuke's friends. Even though he has known Kousuke for ages, he still can't perceive him and tends to forget about his existence even though he is near him.

Kentarou Nomura
One of Kousuke's friends. Even though he has known Kousuke for ages, he still can't perceive him and tends to forget about his existence even though he is near him.

Hajime Nagumo
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. Like most of his classmates who are terrified of Hajime, Kousuke takes this warning about killing anyone that stands in his way seriously, as he doesn't want to die by Hajime's hands, even after he murdered Daisuke Hiyama. 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 considers 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.

Lana Haulia
Kousuke's fiancée. She is one of the few people who manages to perceive Kousuke even after he uses all of his skills to hide his presences. This causes Kousuke to fall in love with her during climactic battle. At first, he is rejected successively, but after seeing his determination, in order to hide her shyness, she presents him with a condition that if he can clear a Great Labyrinth and manage to at least put a scratch on Hajime, she will consider going go out with him, which he eventually succeeds in doing. This causes her to accept Kousuke wholly and, because of his strength, Kousuke gets elected as the next clan leader for the Haulia. Because of his future position, Lana has adamantly decided to create a harem of seven wives for Kousuke and is looking around the world to find them. She also considers herself as the reason who created Kousuke's "Abyssgate" persona.

Emily Grant
Emily falls in love with Kousuke after going through much trouble involving a special drug she created. She entered Kousuke's harem by Lana despite the fact he doesn't want her to.

Vanessa Paradis
An agent from Britain's security bureau responsible for Emily's safety. She becomes infatuated with Kousuke and enters his harem by Lana and declares herself his third wife.

Claudia Barenberg
A saint from a secret organization "Omnibus" that is located in the Vatican City. She is hunted by a powerful demon who wants to use her body to aid in his rebirth. After the demon is defeated, she confesses her feelings to Kousuke much to the shock of Emily. She is one of the few people to be able to perceive Kousuke at all times.