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!
| Writing | Miki Yoshikawa | Comic Book |
| Directing | Yoshiyuki Shirahata | Series Director |
| Visual Effects | Aya Takano | Character Designer |
| Writing | Yasuhiro Nakanishi | Series Composition |
| Directing | Hiroaki Akagi | Series Director |
| Sound | Rei Ishizuka | Original Music Composer |
| Visual Effects | Aiko Yamagami | Color Designer |
| Production | Daijo Kudo | Executive Producer |
| Production | Hitoshi Ono | Executive Producer |
| Production | Toshihide Yamada | Executive Producer |
| Production | Sho Tanaka | Executive Producer |
| Production | Makoto Furukawa | Executive Producer |
| Production | Noboru Sugiyama | Executive Producer |
| Art | Koichi Konno | Prop Designer |
| Art | Hiroki Matsumoto | Art Direction |
| Art | Kiya Hirayoshi | Art Designer |
| Camera | Eiki Eto | Director of Photography |
| Camera | Shigemitsu Hamao | Director of Photography |
| Visual Effects | Norikazu Kamibayashi | CGI Director |
| Editing | Aya Hida | Editor |
| Sound | Noriyoshi Konuma | Sound Director |
| Sound | Katsuhiro Nakano | Sound Effects |
| Production | Nobuaki Takahashi | Producer |
| Production | Tsutomu Tachibana | Producer |
| Production | Yuki Mori | Producer |
| Production | Motomichi Araki | Producer |
| Production | Nobuhiko Kurosu | Producer |
| Crew | Naoya Kinoshita | Special Effects |
| Editing | Yuka Yamajo | Assistant Editor |
| Sound | Nao Murakoshi | Sound Mixer |
| Production | Masahiro Hibi | Associate Producer |
| Production | Kaori Yamazaki | Associate Producer |
| Production | Rie Ogura | Co-Executive Producer |
| Production | Shuzo Kasahara | Co-Executive Producer |
| Production | Yuko Takaishi | Co-Executive Producer |
| Production | Junichiro Tamura | Co-Executive Producer |
| Production | Takuya Akasaka | Co-Executive Producer |
| Production | Kazunari Ishii | Co-Executive Producer |
| Production | Masashi Yagi | Co-Executive Producer |
| Art | Hisae Arimoto | Assistant Art Director |
