Oh Boy, Was I Wrong About Her

Details

Also known as: Tenkousaki no Seiso Karen na Bishoujo ga, Mukashi Danshi to Omotte Issho ni Asonda Osananajimi datta Ken, 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, Tenkosaki: The Neat and Pretty Girl at My New School Is a Childhood Friend of Mine Who I Thought Was a Boy, Tenbin
Type: TV
Status: Finished Airing
Score: 6.8
Episodes: 12
Genres: Comedy, Romance
Studio: project No.9
Aired: 2026-07-06 to 2026-09-21
Season: Summer 2026

Where to watch (US)

Crunchyroll
Crunchyroll Amazon Channel

Synopsis

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.

Episodes

Episode 1: Beginning with a Summer Day (2026-07-06)
Episode 2: I Really Suck at Girl Talk (2026-07-13)
Episode 3: Produced by Himeko (2026-07-20)
Episode 4: Small Hands, Broad Shoulders (2026-07-27)
Episode 5: Discipline, Young Maiden (2026-08-03)
Episode 6: What About Your Camouflage!? (2026-08-10)
Episode 7: You're Special (2026-08-17)
Episode 8: Where the Heart Is (2026-08-24)
Episode 9: Truly Special (2026-08-31)
Episode 10: We Are Friends, Right? (2026-09-07)
Episode 11: As Long As We're Together (2026-09-14)
Episode 12: Episode 12 (2026-09-21)

Characters and voice actors

Haruki Nikaidou (main character) · Japanese voice: Ikumi Hasegawa
Hayato Kirishima (main character) · Japanese voice: Shunichi Toki
Himeko Kirishima (supporting character) · Japanese voice: Miharu Hanai
Minamo Mitake (supporting character) · Japanese voice: Natsumi Haruse
Iori Mori (supporting character) · Japanese voice: Kakeru Hatano
Saki Murao (supporting character) · Japanese voice: Fuuka Izumi
Kazuki Kaidou (supporting character) · Japanese voice: Genta Nakamura
Grandpa Gen (supporting character) · Japanese voice: Shinya Takahashi
Tomoko Ii (supporting character) · Japanese voice: Misa Segawa
Ema Isami (supporting character) · Japanese voice: Yuuna Ogata
Kazuyoshi Kirishima (supporting character) · Japanese voice: Takeshi Ohba
Mayumi Kirishima (supporting character) · Japanese voice: Mii Miki
Nagahisa Mitake (supporting character) · Japanese voice: Kouichi Souma
Saki's Grandmother (supporting character) · Japanese voice: Kumiko Nakane
Saki's Mother (supporting character) · Japanese voice: Jinko Konnai
Seiji Sakurajima (supporting character) · Japanese voice: Junichi Yanagita
Airi Satou (supporting character) · Japanese voice: Nene Hieda
Shiranami (supporting character) · Japanese voice: Hikari Sonoyama
Takachiho (supporting character) · Japanese voice: Naoki Sakurai
Mao Takura (supporting character) · Japanese voice: Yuuko Kaida

Opening and ending songs

Opening 1: Natsu ni Kasanete · DIALOGUE＋
Ending 1: Tilt · harmoe