Appears on releases
| # | Title | Length | Track artist | Release title | Country/Date | ||||
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 1.8 | 幸福のセオリー | ?:?? | 鮎川麻弥 | CANDY GAME |
| ||||
| 1.8 | 幸福のセオリー | 5:10 | 鮎川麻弥 | CANDY GAME |
| ||||
| 1.8 | 幸福のセオリー | 5:10 | 鮎川麻弥 | Candy Game |
| ||||
| 1.8 | 幸福のセオリー | 5:07 | 鮎川麻弥 | Perfect Best |
| ||||
| 1.8 | 幸福(しあわせ)のセオリー | 5:10 | 鮎川麻弥 | Candy Game |
| ||||