7.1 Seraph of the End: Guren Ichinose: Catastrophe at Sixteen.Note: This is the page for Yu in the manga and light novels, for the anime article detailing Yu see: Yūichirō Hyakuya (Anime). Unknowingly a part of, and caught up in other's long term plots, Yu would have no memory that a child Yu existed in the ancient world who was involved with the first vampire, who became Shikama Dōji. Yu also appears in prequel materials Seraph of the End: Guren Ichinose: Catastrophe at Sixteen and Seraph of the End: The Story of Vampire Michaela.
His swordsmanship would allow him to generate demonic powers to help survive and overcome foes. Pursuing power to help save others, Yu developed a strong sense of looking out for family members. Battling alongside fellow squad members Yoichi Saotome as well as Shihō Kimizuki and Mitsuba Sangū, after vampires launch major assaults on human cities, Yu would come into contact with Mika again. Trained in part by Guren Ichinose, in combat Yu wields a Cursed Gear sword after making a contract with the demon, Asuramaru. Motivated to enact vengeance against vampires, four years later Yu becomes a member of the Japanese Imperial Demon Army, and joins Shinoa Hīragi's squad in the Moon Demon Company. During an escape from the vampire city they were raised as livestock in, Yu was the only one to escape from a trap by Ferid Bathory that resulted in his orphanage family being killed, where he also had to leave Mika behind.
The main protagonist of the Seraph of the End: Vampire Reign manga, Yu along with Mikaela Hyakuya, possesses the " seraph" gene.
Gaku Sano Yūichirō Hyakuya ( 百夜 優一郎, Hyakuya Yūichirō ?), birth name Yūichirō Amane ( 天音 優一郎, Amane Yūichirō ?), is a character in Seraph of the End.