Saaya has always been in love with Yuuki since high school, but she has never dared to tell him this, and when she tried to do it, she found herself doing something that she will regret for several years. One day, when she visited her grandfather, he gives her a small box of music with certain powers ... Will she be able to make amends for his mistake or will her love for Yuuki lead her to make more nonsense?

Contains different stories from multiple artists:

•「バイバイregret」by KONNO Risa

•**「E.T.C」**by SAKURAKOUJI Kanoko

•「朝まで2人。」by FUKUSHIMA Haruka

•「初恋むすび」by SEKI Natsumi

•「17・birthday」by KOMORI Ringo

•「朝5時のハットトリックボーイ」by HARUNA Hiro

•「三塔恋巡り」by Chiyori