Shounen ga Otona ni Natta Natsu - E01
In Episode 1 of Shounen ga Otona ni Natta Natsu, Ryuki Kirishima, a high schooler living with his sister Reiko after their parents’ death, watches adult videos with friends. He becomes fixated on Kiriru, a popular porn actress, and wins a contest to meet her. To his shock, Kiriru is Reiko’s friend and seduces him in his room, leading to an intimate encounter where he loses his virginity, hinting at complex familial ties.
