Oh Boy, Was I Wrong About Her

TV anime2026

1 season12 episodes

Original: light novel

Looking for the manga? This page follows the light novel; the manga adaptation has its own volume numbers.

Suggested reading (Japanese · KADOKAWA): Season 1 ends at Ep 12. Continue with Vol. 4. As of 2026-10-05, the original light novel is complete at Vol. 11.

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.

Synopsis: TMDB

Book languageJapanese

EditionKADOKAWA

Season 1

Medium confidence

12 episodesJul 2026 – Sep 2026

Anime ends at: Ep 12
Read next: Vol. 4light novel · Japanese · KADOKAWA

After all 12 episodes of Season 1, continue the original light novel from Volume 4. It carries the story beyond the shorter manga adaptation; the anime leaves out some details of the characters’ relationships.

転校先の清楚可憐な美少女が、昔男子と思って一緒に遊んだ幼馴染だった件4

KADOKAWAJapanesePaperback

Buy Vol. 4 on Amazon

Also in manga:

転校先の清楚可憐な美少女が、昔男子と思って一緒に遊んだ幼馴染だった件Vol. 7Buy on Amazon
After all 12 episodes of Season 1, start the manga adaptation at the beginning of Volume 7 to pick up material the anime skipped near the end. This is the manga’s final volume; the original light novel continues further.