Anime Main Character Mistakes His Mom for His Sister Yuu Otosaka (乙坂 有宇, Otosaka Yuu ) is the master protagonist of the story and a showtime-year transfer pupil at Hoshinoumi University . He has the ability to temporarily possess a person for 5 seconds. However, it is later revealed that his actual ability is stealing the abilities of the ability-user he possesses. Towards the end of the serial, he becomes widely known (and feared) as the One-Eyed Grim Reaper. He is as well the younger brother of Shunsuke Otosaka , and the older brother of Ayumi Otosaka . Appearance Yuu has dark dark-brown hair, and maroon eyes, various outfits throughout the series but is by and large seen in his Hoshinoumi compatible, which consists of a black jacket and a white nether-shirt with