Overview
Kotoko, who has just started high school, feels bored on a daily basis. Seated behind her in class is Sachi Seto, who is struggling with illness. Though she has not yet met anyone, they all call her Sacchan. One day, a mysterious girl appears before Kotoko, changing her boring existence. Who is she?
| Actor | Age then | Age now | |
|---|---|---|---|
 | 20 | 28 | |
 | 16 | 24 | |
 | 16 | 23 |