De 16-jarige Nagi Umino, tweedejaars student aan de middelbare school Megurogawa Academy, werd bij de geboorte verwisseld. Op weg naar een diner om zijn biologische ouders te ontmoeten, ontmoet hij per ongeluk de onbezonnen, openhartige Erika Amano, die vastbesloten is om van Nagi haar nep vriendje te maken, aangezien ze nooit echt wil trouwen. Maar zodra Nagi aan tafel komt, merkt hij dat zijn ouders hebben besloten de verwisseling in het ziekenhuis op te lossen door hem voor het gemak te laten trouwen met de dochter die zijn biologische ouders hebben grootgebracht... die niemand minder blijkt te zijn dan Erika zelf!
| Directing | 白幡良志之 | Series Director |
| Writing | Miki Yoshikawa | Comic Book |
| Visual Effects | 髙野綾 | Character Designer |
| Writing | 中西やすひろ | Series Composition |
| Directing | 赤城博昭 | Series Director |
| Sound | 石塚玲依 | Original Music Composer |
| Sound | Nao Murakoshi | Sound Mixer |
| Production | 髙石優子 | Co-Executive Producer |
| Production | Daijo Kudo | Executive Producer |
| Camera | 浜尾繁光 | Director of Photography |
| Visual Effects | 神林憲和 | CGI Director |
| Production | Rie Ogura | Co-Executive Producer |
| Production | Kazunari Ishii | Co-Executive Producer |
| Production | 笠原周造 | Co-Executive Producer |
| Production | Junichiro Tamura | Co-Executive Producer |
| Editing | 肥田文 | Editor |
| Production | Yuki Mori | Producer |
| Sound | 中野勝博 | Sound Effects |
| Production | 山﨑香利 | Associate Producer |
| Visual Effects | 山上愛子 | Color Designer |
| Production | 田中翔 | Executive Producer |
| Art | 松本浩樹 | Art Direction |
| Production | Tsutomu Tachibana | Producer |
| Production | 赤坂拓也 | Co-Executive Producer |
| Production | 杉山登 | Executive Producer |
| Art | 今野幸一 | Prop Designer |
| Production | 高橋伸明 | Producer |
| Camera | 衛藤英毅 | Director of Photography |
| Production | 荒木元道 | Producer |
| Art | Hisae Arimoto | Assistant Art Director |
| Sound | 小沼則義 | Sound Director |
| Crew | 木下尚也 | Special Effects |
| Editing | 山条裕香 | Assistant Editor |
| Production | Hitoshi Ono | Executive Producer |
| Production | 山田俊秀 | Executive Producer |
| Production | 古川慎 | Executive Producer |
| Art | Kiya Hirayoshi | Art Designer |
| Production | 黒須信彦 | Producer |
| Production | 日比政広 | Associate Producer |
| Production | Masashi Yagi | Co-Executive Producer |
