Mitsuki and Yuya become stepsister and stepbrother because of their parents' marriage. Mitsuki can't get along with her new family and Yuya doesn't know how to approach his new stepsister. One day, Mitsuki becomes possessed by the spirit of Hiyori. Hiyori likes Yuya and believes Yuya can help her get to heaven. Hiyori places a leather chastity belt upon on Mitsuki and a plan takes place to help send Hiyori to heaven.
Unfortunately the movie Recently, My Sister is Unusual is not yet available on HBO Max.
| Writing | Iggy Coen | Screenplay |
| Writing | Takehiko Minato | Screenplay |
| Directing | Iggy Coen | Director |
| Directing | Yuki Aoyama | Director |
| Production | Yuichi Shibahara | Producer |
| Production | Ujikatsu Omori | Producer |
| Production | Takeshi Yasuda | Co-Executive Producer |
| Sound | Hajimetal | Original Music Composer |
| Production | Hidehisa Chiwata | Producer |
| Production | Masahiko Mizuguchi | Co-Executive Producer |
| Sound | Tenka Hashimoto | Theme Song Performance |
| Camera | Yuji Imai | Director of Photography |
| Production | Shinichirou Inoue | Executive Producer |
| Production | Akio Motojima | Line Producer |
| Costume & Make-Up | Naomi Oikawa | Makeup & Hair |
| Costume & Make-Up | Tomo Hyakutake | Special Effects Makeup Artist |
| Production | Jun Sato | Production Manager |
| Sound | Kengo Takasuka | Sound Recordist |
| Production | Yoshino Kusuma | Casting |
| Editing | Yōsuke Yafune | Editor |
| Directing | Jun Ishii | Assistant Director |
| Writing | Mari Matsuzawa | Comic Book |
| Art | Kôsuke Nishibuchi | Set Decoration |
| Lighting | Masamichi Ohmachi | Gaffer |
| Art | Shuji Yamashita | Art Direction |
| Sound | Hiroki Matsuura | Sound Effects |
