When lazy, erotic-game loving Mahiro Oyama is transformed into a girl by his younger scientist sister's experiments, he becomes determined to change back, only to recognize that with his new opportunity, he may want to turn his life around.
You can now watch ONIMAI: I'm Now Your Sister! online on the following streaming providers in the United States.
| Writing | Michiko Yokote | Series Composition |
| Visual Effects | Ryo Imamura | Character Designer |
| Directing | Shingo Fujii | Series Director |
| Sound | Alisa Okehazama | Original Music Composer |
| Sound | Daisuke Achiwa | Original Music Composer |
| Visual Effects | Makiko Doi | Color Designer |
| Art | Masayo Kobayashi | Art Direction |
| Sound | Kohei Yoshida | Sound Director |
| Sound | Enako | Theme Song Performance |
| Editing | Yuji Oka | Editor |
| Sound | Kaori Ishihara | Theme Song Performance |
| Camera | Akane Fushihara | Director of Photography |
| Sound | Hisako Kanemoto | Theme Song Performance |
| Sound | Marika Kouno | Theme Song Performance |
| Sound | Takuya Hasegawa | Sound Effects |
| Sound | Pmarusama | Theme Song Performance |
| Sound | Minami Tsuda | Theme Song Performance |
| Production | Sosuke Asano | Executive Producer |
| Production | Hirotaka Kaneko | Executive Producer |
| Crew | Mitsuki Tsugioka | Special Effects |
| Production | Kazutaka Yamanaka | Executive Producer |
| Production | Nobuhiro Osawa | Executive Producer |
| Production | Keiji Ota | Executive Producer |
| Production | Norio Fukui | Executive Producer |
| Production | Asuka Yamazaki | Executive Producer |
| Visual Effects | miton | Lead Animator |
| Production | Mitsuteru Hishiyama | Producer |
| Visual Effects | Yuki Matsuguma | Lead Animator |
| Production | Katsuya Tasaki | Executive Producer |
| Visual Effects | Genki Uchiyama | Lead Animator |
| Sound | Yoshiki Kobayashi | Music Producer |
| Sound | Naomi Fujita | Sound Mixer |
| Production | Katsuyuki Imai | Executive Producer |
| Production | Katsuhiro Takei | Executive Producer |
| Production | Kazunari Okuma | Executive Producer |
| Visual Effects | Kay Yu | Lead Animator |
| Art | Hiroshi Inoue | Assistant Director of Photography |
| Production | Fuminori Yamazaki | Executive Producer |
| Production | Atsushi Takahashi | Executive Producer |
| Production | Takurou Hatakeyama | Producer |
| Production | Ryu Takahashi | Executive Producer |
| Art | Masayuki Niitsuma | Art Designer |
| Crew | Nekotoufu | Creator |
