| idol_id | 712 |
| Selca owner | ske48_koishichan |
| Pop type | J-Pop |
| Stage name (romanized) | Koishichan |
| Stage name (original) | 小石ちゃん |
| Real name (romanized) | Koishi Kumiko |
| Real name (original) | 小石公美子 |
| Birth date | 1995-08-04 (age 29) ▲ ▼ |
| Chinese zodiac sign | 🐖 Pig |
| Western zodiac sign | ♌ Leo |
| Hometown | Hyogo |
| Height | 160.0cm (5'3") ▲ ▼ |
| Weight | |
| Blood type | |
| Debut date | 2013-11 ▲ ▼ |
| Country of origin | 
Japan |
| Name | Company | Fandom | Debut date | Disbandment date | Current member | |
|---|---|---|---|---|---|---|
|
SKE48 | avex trax | 2008-07-30 | No |