Yui Matsumoto is beautiful, talented, and seemingly sweet, but beneath her calm exterior lies an obsessive love for one person: Yuto Takahashi. She watches him closely, protects him in ways no one else notices, and becomes dangerously jealous of anyone who gets too close.

Yuto, on the other hand, is the playful, charming class clown. He’s oblivious to Yui’s obsessive tendencies, yet he finds himself drawn to her in ways he doesn’t fully understand. Confused by his own hidden feelings, he’s caught between amusement, fear, and an attraction he cannot deny.

When fate pairs them for a school project, their daily interactions become a minefield of comedic mishaps, heart-fluttering moments, and subtly tense encounters. As Yuri's obsession grows, and Yuto struggles with his emotions, their school life turns into a delicate balance of romance, jealousy, and slice-of-life comedy, proving that love can be as thrilling as it is dangerous.