Mirai's elder brother. He has taken care of her since she was afflicted by the Apocalypse Virus in 2012. Since she was unable to move on her own and they had to avoid both the Horsemen of John and the vampires, this was very hard on him. Mirai told his friends she wanted to die, and they tried to get Shiho to kill her. He refused. In 2020, he has become a member of the Japanese Imperial Demon Army's Moon Demon Company in order to pay for her medical expenses and get proper care for her. She cares greatly for her brother as seen when she calls out to him while she is being experimented on.
Mirai is merely a test subject to Kureto. He thinks nothing of her other than her being a seraph that suits his needs as a proper experiment.
He appears alongside Kureto and her when they invade Sanguinem.
Mirai is merely a test subject to Aoi. She thinks nothing of her other than her being a seraph that suits Kureto's needs as a proper experiment.