Yun-lee is a girl who is carrying a huge emotional scar in her heart. Due to an accident, she lost 2 precious years of her life, the time period between 19 and 21 years old. Her life is empty. She is miserable, but still attending a preparatory school in an attempt to catch up with all the time she has lost. Suddenly, one day on her way to feed some stray cats, she comes across a young man who seems to have what she has lost… the period between 19 and 21 years old.
Fifteen-year-old country girl Suzume Yosano has to move to Tokyo to live with her uncle due to her father’s transfer. She bumps into a mysterious man who ends up taking her to her uncle’s place after she gets lost. Turns out, Suzume will be seeing him a lot more often once she starts school because… he’s her homeroom teacher?!