Kurou Sakuragawa

 When he was a kid living in a traditional Japanese house with his extended family. While eating dinner with the rest of his family, all of his cousins, and possibly siblings, seem to collapse and die within seconds of eating. His grandmother has revealed that he had been fed both Kudan and Ningyo meat as part of the Sakuragawa family's aim of creating someone who could predict the future and not die. His grandmother evaluated the effectiveness of the meat by cutting open his head to determine if there was any discomfort. His cousin Rikka was the only one to make it through. He also discovered an accomplice, Saki Yumihara. Later in the same year, he attended the same college. He stayed with Rikka at H-university, in which he was a 2nd-year student, and also a student in the law school. Saki uncovers the truth about him after they go to an altar and find the Kappa.