| Title | Year | ☷ | |
|---|---|---|---|
| Oni Chichi 👁 | ---- | … | |
| Oni-chan Dakedo Ai Sae Areba Kankeinai yo ne! | 2012 | … | |
| Only A Stonecutter 👁 | ---- | … | |
| Only The Brave | 2017 | … | |
| Onward | 2020 | … | |
| Ookami Kodomo no Ame to Yuki 👁 | ---- | … | |
| Ookami to Koushinryou | ---- | … | |
| Ookami to Koushinryou 2 | ---- | … | |
| Ooops Noah is Gone... 👁 | 2015 | … | |
| Open Grave | 2013 | … |