Koiwai Hiroyoshi
- Name: Koiwai Hiroyoshi
- Native name: 小岩井宏悦
- Nationality: Japanese
- Gender: Male
- Born: July 28, 1960
- Age: 64
Screenwriter
| Title | Rating |
|---|---|
| Lumberjack the Monster | 7.4 |
Producer
| Title | Rating |
|---|---|
| Shining Boy & Little Randy | 7.2 |
| g@me. | 7.3 |
| Artificial Beauty | 6.8 |
| Hikon Kazoku | 6.2 |
| Nisennen no Koi | 7.0 |
| Kamisama Mou Sukoshi Dake | 7.9 |
| Love Generation | 7.6 |
| Age 35 Koishikute | 6.3 |
| Itsuka Mata Aeru | 6.9 |
| Bokura ni Ai wo! | 7.8 |
Executive Producer
| Title | Rating |
|---|---|
| Cells at Work! | 0.0 |
| Re/Member | 7.4 |
| Rurouni Kenshin: The Final | 8.6 |
| Way to Find the Best Life | 7.6 |
| Gintama 2: Rules Are Meant to Be Broken | 8.0 |
| Bleach | 7.6 |
| Marmalade Boy | 7.3 |
| Gintama | 7.7 |
| Blade of the Immortal | 7.5 |
| Museum | 7.5 |
| Wolf Girl and Black Prince | 7.3 |
| Terra Formars | 6.4 |
| Terra Formars - Aratanaru Kibou | 6.3 |
| Erased | 7.4 |
| Rurouni Kenshin: The Legend Ends | 8.8 |
| Rurouni Kenshin: Kyoto Inferno | 8.7 |
| Straw Shield | 7.2 |
| Rurouni Kenshin | 8.6 |
| Paradise Kiss | 7.8 |
| The Incite Mill | 7.2 |
| Densha Otoko | 7.5 |
| Lakeside Murder Case | 6.9 |
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