| Oreimo follows the daily life of an ordinary high school boy named Kyousuke Kousaka. Kyousuke’s younger sister Kirino is a pretty fashion model, but also hides a dark secret of being an otaku of adult games. Kyousuke is the only person to whom Kirino reveals her hidden obsession and other issues. |
| Name | Character | Episodes |
|---|---|---|
| Saori Hayami | Ayase Aragaki (voice) | 25 |
| Kana Hanazawa | Ruri Gokou (voice) | 25 |
| Yuichi Nakamura | Kyousuke Kousaka (voice) | 25 |
| Hitomi Nabatame | Saori Vageena (voice) | 25 |
| Akeno Watanabe | Yoshino Kousaka (voice) | 10 |
| Fumihiko Tachiki | Daisuke Kousaka (voice) | 8 |
| Yukari Tamura | Kanako Kurusu (voice) | 5 |
| Go Inoue | Gennosuke Miura (voice) | 5 |
| Yoshitsugu Matsuoka | Kaeda Makabe (voice) | 2 |
| Yoshitsugu Matsuoka | Kaede Makabe (voice) | 1 |
| Yukari Tamura | Kanako Kuruse (voice) | 1 |
| Yukari Tamura | Kuraka Hosino (voice) | 1 |
| Yukari Tamura | Kurara Hoshino (voice) | 1 |
| Shizuka Itoh | Iori Fate Setsuna (voice) | 1 |