[TENNY-LE-TAI (R.Koga/Aru Koga)] Mun Mun Moon (Sailor Moon)
[Koga Ryouhei] PrelfIllust No3 HighComics
[R. Kogakun (R-Koga)] Kageki na Houkago Benkyo-kai
[Koga Ryohei] El-tentacle Birth Lady's Mk.B Ex.1
(C82) [Seven Days Holiday (Shinokawa Arumi, Koga Nozomu)] Marriage Experience (Sword Art Online)
(C84) [Seven Days Holiday (Shinokawa Arumi, Koga Nozomu)] ULTIMARATIO (Sword Art Online)
(C83) [Seven Days Holiday (Shinokawa Arumi, Koga Nozomu)] SISTER FAERIE (Sword Art Online)
(SC60) [Seven Days Holiday (Shinokawa Arumi, Koga Nozomu)] NO WORK, NO LIFE? (Hataraku Maou-sama!)