Yuichiro Hyakuya's Katana Seraph of the end

Yuichiro Hyakuya's Katana Seraph of the end. Seraph of the End is a Japanese dark fantasy manga series. It is set in a world where a virus has almost completely wiped out the world's population, leaving only children under the age of 13 to survive. Vampires also appeared. A young man, Yuichiro 'Yu' Hyakuya, wants to kill the vampires after one kills almost all the residents of his orphanage.

Yuichiro Hyakuya is the main character of the Owari no Seraph series. He is a member of the Imperial Japanese Demon Army and Shinoa Hiragi's team in the Moon Demon Squad. He and Mikaela Hyakuya carry the 'Seraph' gene, which is important to the Forbidden Taboo and central to the 'Seraph of the End' story.