Oyama Koichiro
- Name: Oyama Koichiro
- Native name: 大山晃一郎
- Also Known as: Ooyama Kouichirou
- Nationality: Japanese
- Gender: Male
- Born: August 2, 1985
- Age: 38
Director
| Title | Rating |
|---|---|
| Around 1/4 | 7.4 |
| Keiji 7-nin Season 8 | 6.8 |
| Keiji 7-nin Season 6 | 7.4 |
Screenwriter & Director
| Title | Rating |
|---|---|
| Idol Shikkaku | 7.3 |
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