Oh Boy, Was I Wrong About Her: Story, Cast and Series Facts

Story and premise

Seven years after making a childhood promise to always be friends, Hayato is reunited with his formerly tomboyish pal Haruki at a city high school–only now, Haruki has transformed into the girl every guy dreams about! While Haruki's looks may have changed, with Hayato, she's still the same pal he remembers. Despite years apart, their promise and feelings remain and deepen into something stronger.

Series details

• Title: Oh Boy, Was I Wrong About Her
• Format: Animation
• Language: Japanese
• Genres: Comedy, Anime, Romance
• Premiere date: 2026-07-06
• Final broadcast date listed: 2026-09-21
• Status in TVmaze: Ended
• Network listed by TVmaze: Tokyo MX
• Network country: Japan
• Typical episode runtime: 30 minutes
• TVMaze ID: 91283
• TVDB ID: 467401

Cast and credited roles

• Ikumi Hasegawa — Haruki Nikaido
• Shunichi Toki — Hayato Kirishima
• Miharu Hanai — Himeko Kirishima
• Haruse Natsumi — Minamo Mitake
• Fuka Izumi — Saki Murao

Seasons in the TVmaze catalogue

• Season 1: premiered 2026-07-06; final listed air date 2026-09-21.

Source and licence

Adapted from Oh Boy, Was I Wrong About Her on TVmaze. The synopsis is reproduced as plain text; catalogue facts, cast and season records are selected and reformatted. This adapted text is available under CC BY-SA 4.0, following the TVmaze API licence. Network and web-channel credits identify the service listed in this source; they do not establish current streaming availability.