| BIRTH DAY | 1982.3.24 |
| AGE | 18 |
| chronological table | |
| age 1〜2 | sister(misao) came into the world |
| elementary school 1st〜2nd | father died |
| elementary school 1st〜3nd | mother become cult member |
| after... | mother abscond |
| after... | aunt Yukiko was got custody of Kohei |
| high school 2nd | disappear from world |