Saaya harbored feelings for Yuuki since high school but never expressed them. When she finally gathered the courage to confess, she made a mistake that haunted her for years. During a visit to her grandfather, he gifted her a box of music with mystical abilities. Will Saaya undo her error or let her love for Yuuki lead to more blunders?
Included are various stories from multiple artists, such as KONNO Risa's "Say Goodbye to Regret," SAKURAKOUJI Kanoko's "E.T.C," FUKUSHIMA Haruka's "Together Until Morning," SEKI Natsumi's "First Love Knot," KOMORI Ringo's "17th Birthday," HARUNA Hiro's "Hat Trick Boy at 5AM," and Chiyori's "Tour of Three Towers Love."