H04115 Shounen ga Otona ni Natta Natsu Episode 4: Reiko's Secret Room

Kirishima Ryuki finally decides to open the door to Reiko's room, which she has kept hidden for four years, and discovers the truth about her nature. As Reiko strays further, she is reminded of her past, and Ryuki feels a sense of liberation. His feelings grow so strong that he cannot turn back, and their secret continues into adulthood.