Having developed feelings for her first crush, Rena opens up to them about her emotions, but is disheartened when she learns that they share the same gender. Adding to her distress, she finds out that her heartfelt letter to her beloved senior has been destroyed and left unread.
Later, Rena joins a fortune-telling club on her friend's suggestion and finds herself in a bewildering situation where the enigmatic fortune-teller takes away her ability to see colors. The story follows Rena's relationships with her trusted lifelong companion, her compassionate senior, and the cryptic fortune-teller, who aims to broaden her horizons by thrusting her into a monochrome existence.
