Shinya Hīragi/Relationships

Kureto Hīragi
The most likely to become the next leader of the JIDA. He suspects Shinya may be a vampire spy because he is close to Guren. He says he trusts Guren and sends Guren on an extremely dangerous mission to Nagoya. A member of the prestigious Hiragi family.

Mahiru Hīragi
Guren's former lover and Shinya's former fiancée. Inventor of the Cursed Gear, she eventually becomes consumed with her research and becomes a demon. Guren kills her, and she becomes the demon in his sword. Shinoa Hiragi's elder sister.

Seishiro Hīragi
A higher-ranking member of the JIDA. A member of the prestigious Hiragi family.

Shinoa Hīragi
A squad leader in the Moon Demon Company. Guren uses Shinya and Mito Jujo to help train her briefly before the attack on Nagoya. Shinya works with her and Narumi's squads in Nagoya.

Tenri Hīragi
Leader of the Japanese Imperial Demon Army as well as the Hiragi family, he looks down on Guren, who is from a lower branch family. He adopted Shinya into the Hiragi family as a fiancé for Mahiru.

Norito Goshi
A member of Guren's squad since he was 15 back in high school prior to the apocalypse. He enjoys making fun of Guren, and Shinya and he often team up to do so. A member of the prestigious Goshi family.

Sayuri Hanayori
A member of Guren's squad since she was 15 back in high school prior to the apocalypse. She teaches the students training in the Moon Demon Company. She has a crush on Guren.

Yūichirō Hyakuya
A newbie soldier, who Guren experimented on. A wielder of a Black Demon. A member of Shinoa's squad, and a hothead, who challenged Shinya to a fight. He knows little about the Hyakuya Sect.

Guren Ichinose
Commander of the Moon Demon Company. Shinya and Guren have been friends since high school. Guren loved Mahiru Hiragi, Shinya's fiancée. When he learns Kureto gave Guren a suicidal mission in Nagoya, Shinya joins with Guren to help him.

Mito Jujo
A member of Guren's squad since she was 15 back in high school prior to the apocalypse. She appears to be tsundere toward Guren, but he is not interested. A member of the prestigious Jujo family.

Shihō Kimizuki
A newbie soldier Guren experimented on. A wielder of a Black Demon. A member of Shinoa's squad. He gets tricked when Shinya attacks them from behind during a match to train Shinoa.

Mitsuba Sangū
A soldier of the Moon Demon Company. She works under Shinoa as part of her squad. A member of the prestigious Sangu family.

Yoichi Saotome
A newbie soldier Guren experimented on. A wielder of a Black Demon. A member of Shinoa's squad. He gets tricked when Shinya attacks them from behind during a match to train Shinoa. Shinya coaches him on sniping.

Shigure Yukimi
A member of Guren's squad since she was 15 back in high school prior to the apocalypse. She does not speak often.

Ferid Bathory
An extremely powerful vampire, who gets Guren by the neck during the battle at Shinjuku. Until Shinya snipes him, that is. Unfortunately, he escapes the battle with minor injuries.

Lucal Wesker
Shinya works with Shinoa and Narumi's squads to exterminate him in Nagoya.