Kureto Hīragi/Relationships

General Tenri Hīragi
Kureto follows his orders however he does not hold any loyalty to him and plans on killing him in order to take over the Japanese Imperial Demon Army (JIDA). He betrays his fathers orders in small ways to help Guren find Mahiru.

Major General Seishiro Hiragi
Kureto regards him as an incompetent coward due to him never taking place on the front lines, and isn't hesitant to threaten him to the point where Seishiro begs for him not to kill him. He implies to be unaware that Seishiro has an inferiority complex towards him and plans to defeat him one day, although nonetheless isn't intimidated by his younger brother.

Major General Shinya Hiragi
Adopted into the prestigious Hiragi family. Kureto says that he originally comes from a lower branch family, so no one would care if he died.

Sergeant Shinoa Hīragi
Kureto has nor wants anything to do with her, and she is the only member of her squad Kureto did not ask about the battle at Shinjuku or the users of the Black Demon Series. Before the apocalypse, he threatened to have her raped and even to break her neck while interrogating Guren. During the battle in Nagoya, Kureto recommended that she'd join him in gaining power with the Seraph of the End experiment, although she refused this. Shinoa, behind his back, calls him as a monster because he is merciless, including to his own siblings.

Mahiru Hī ragi
In high school, the two were competing against each other for the head of the Hiragi family. Kureto had jealousy towards her due to her abilities and as her demon side became stronger, Mahiru often would play and mock him, telling Kureto that she never felt envy towards him, and that Father would trust her more since she was stronger. When she fought him he overpowers her briefly and is not above to use sacrifices to defeat her commenting for humanity sake. He later reveals her location to Guren to stop her plans. Eight years later, after becoming Guren's weapon, Mahiru manipulates Guren into listening to her, rather than Kureto while in battle.

Lieutenant Colonel Guren Ichinose
Commander of the Moon Demon Company. Mahiru Hiragi's lover. He helped Mahiru create Cursed Gear. Kureto and Guren had a rivalry in their school days but despite this, Kureto acknowledges and respects Guren's abilities and his competence in creating Black Demon bearers. He is however exasperated by how Guren cares about his friends too much to betray them, making him very weak in Kureto's mind. Guren claims to be following Kureto, but Kureto suspects him of being a vampire spy and planning a rebellion. Despite that, Kureto claims to trust him, which is backed up by how he gave him an extremely powerful sword from the Hiragi Family. He does not seem to fully approve of Guren's harsh treatment due to him being from a lower branch family, the still prestigious Ichinose family, as despite being fully willing to be cruel and condescending towards him, Kureto is notably the only Hiragi to oppose Sakae's execution. Still, to no avail as he was outvoted, and he also was why Sakae could talk to Guren one last time. After his father beat Guren to submission, Kureto offers to drive him home. When ordered by his father to eliminate Guren, Kureto fights with him then betrays his father and reveals Mahiru's location to Guren. Eight years later he gives Guren a suicide mission in Shinjuku and after killing his father in Osaka. Shikama Doji possessed Kureto though Raimeiki is halting the process, Guren promises him that he will save him. However Shikama Doji later leaves Kureto's body and moves on to Shinoa.

Colonel Mito Jujo
A member of Guren's squad since she was 15 back in high school prior to the apocalypse. A member of the prestigious Jujo family. She is one of the people Kureto intends to sacrifice in order to activate the seraph he has acquired.

Colonel Norito Goshi
A member of Guren's squad since he was 15 back in high school prior to the apocalypse. A member of the prestigious Goshi family.

Second Lieutenant 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.

Second Lieutenant Shigure Yukimi
A member of Guren's squad since she was 15 back in high school prior to the apocalypse. He opts to use her as a sacrifice for his seraph project.

Colonel Aoi Sangu
Kureto's Personal Assistant, older sister of Mitsuba Sangu. He is unaware of her feelings for him and confides all of his plans to her due to her unwavering loyalty to Kureto. She is important enough to him that Tenri threatens to use her as a hostage so Kureto follows his orders. It is later explained by his demon Raimeki that he has very romantic feelings towards Aoi.

Lugi
This vampire notices Kureto Hiragi during the vampire attack against the Thousand Nights research facilities.

Lucal Wesker
Lucal asks Lugi what he is doing and then notices Kureto and Kureto's military force. When Kureto immediately orders his soldiers to back down, Lucal compliments his intelligence and lets them all go, claiming he prefers children's blood anyway.

Shikama Dōji
After killing Tenri Hiragi, Shikama possessed Kureto introducing himself to Kureto as the First Progenitor after demonstrating his power by commanding Abaddon and being immortal. He now possesses Kureto but Raimeiki is halting the process for the time being. Shikama Doji was possessing every head of the Hiragi's family, now coming to have Kureto possessed. However Shikama Doji later decides to possess Shinoa thus leaving Kureto's body.

Raimeiki
Raimeiki is the demon Kureto formed a contract with ever since the light novels and his cursed gear. She takes the form of a black katana with a glowing green streak down the middle. She helped him in sealing Shikama Doji preventing him from taking over his body temporarily. Kureto does not know his own demon abilities unlike other hosts who have knowledge about their demon, however he does have knowledge about her electricity and the drawbacks of it.