Asuramaru/Relationships

Yuichiro Hyakuya
A young soldier in the Moon Demon Company who has been experimented on by the humans. Part of him is not human. Asuramaru becomes his demon weapon after Yu refuses to give into him. He haunts Yu in his dreams for the first three months after they form a contract. When Yu took his training to the next step but asked to be Asuramaru's friend, Asuramaru eventually gave in again but stopped giving him nightmares. Asuramaru has no desire to reveal any secrets or truths to him. Asuramaru seeks to take over his body.

Guren Ichinose
Commander of the Moon Demon Company and one of the developers of demon weapons. Mahiru Hiragi leaves Asuramaru in his care, and he in turn gives Asuramaru to the Hiragi for research purposes.

Mahiru Hiragi
Asuramaru's former master. Guren Ichinose's fiancée and lover. Krul turns her into a vampire, but Guren kills her later.

Mikaela Hyakuya
A young vampire. While battling Yu with nightmares, Asuramaru often takes the form of Mika when he was 12 years old. Asuramaru encourages Yu to escape with him before Yu loses his humanity altogether. Yu's childhood friend.

Krul Tepes
It's revealed in the light novel that Asuramaru was known as Asura Tepes in life, and Krul inquired Mahiru Hiragi of her lost relative when she confronted her.