Seishun, Shikkaku.

"A love story about a dark pure love." Love. Heart. A mistake. I made a mistake with you----. Aine Misabashi, a second-year student at a music high school, has secret feelings for her childhood friend Riko Shirota. When she seeks advice from her close friend Hime (Ayu Yasou), she cannot tell her the feelings she has kept hidden. In this moment, the girl notices her true heart. The feelings of youth crumble away, a story about "a dark pure love" starts now----. The characters' psychological portraits are deep in every way. A daring yet delicate depiction of a complicated love of boys and girls. (Source: Manga Club) Note: Includes one extra chapter.