Seikou Suru Kokuhaku no Shikata

A shy high school student named Haruki has been secretly in love with his classmate, Yui, for years. He spends his days admiring her from afar, too nervous to confess his feelings. One day, he gathers the courage to write a love letter, but his plan takes an unexpected turn when he accidentally drops it in front of her.

Yui picks up the letter and reads it, but instead of the romantic response Haruki hoped for, she invites him to a private meeting after school. There, she reveals a side of herself he never expected, leading to a passionate and intense encounter that changes their relationship forever.