Overview
In the town of Saima, when summer is about to begin, a group of six high school students intend to live a secret adventure by spending seven carefree days in a ruined mining facility.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 22 | 28 | |
 | 22 | 27 | |
 | 33 | 38 | |
 | - | - | |
 | 30 | 36 | |
 | 46 | 52 | |
 | 45 | 51 | |
 | 27 | 32 | |
 | 36 | 41 | |
 | 61 | 67 |