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 |
| Directing | Iggy Coen | Director |
| Writing | Takehiko Minato | Screenplay |
| Directing | Yuki Aoyama | Director |
| Writing | Mari Matsuzawa | Comic Book |
| Production | Ujikatsu Omori | Producer |
| Production | Hidehisa Chiwata | Producer |
| Production | Yuichi Shibahara | Producer |
| Sound | Hajimetal | Original Music Composer |
| Sound | Tenka Hashimoto | Theme Song Performance |
| Production | Shinichirou Inoue | Executive Producer |
| Production | Takeshi Yasuda | Co-Executive Producer |
| Production | Masahiko Mizuguchi | Co-Executive Producer |
| Production | Akio Motojima | Line Producer |
| Camera | Yuji Imai | Director of Photography |
| Lighting | Masamichi Ohmachi | Gaffer |
| Sound | Kengo Takasuka | Sound Recordist |
| Art | Shuji Yamashita | Art Direction |
| Art | Kôsuke Nishibuchi | Set Decoration |
| Costume & Make-Up | Naomi Oikawa | Makeup & Hair |
| Costume & Make-Up | Tomo Hyakutake | Special Effects Makeup Artist |
| Editing | Yōsuke Yafune | Editor |
| Sound | Hiroki Matsuura | Sound Effects |
| Production | Yoshino Kusuma | Casting |
| Directing | Jun Ishii | Assistant Director |
| Production | Jun Sato | Production Manager |
