A fourth teaser visual and special trailer have been unveiled for the Oh Boy, Was I Wrong About Her TV anime series. The anime premiered in Japan on July 6, 2026 and aired for 12 total episodes until September 21, 2026.
The special trailer highlights the seasonal teaser visuals showcasing the series’ heroine Haruki Nikaido across winter, spring, summer, and fall.
Chuanfeng Xu (Apocalypse Hotel Episode 4 director) directed the anime series, with Deko Akao (May I Ask for One Final Thing?) as series composer and N-Nei Kurahashi (The Angel Next Door Spoils Me Rotten sub-character designer) as character designer. Project No. 9 was in charge of the animation production.
Meanwhile, the anime’s main voice cast include:
- • Ikumi Hasegawa as Haruki Nikaido
- • Shunichi Toki as Hayato Kirishima
- • Miharu Hanai as Himeko Kirishima
- • Natsumi Haruse as Minamo Mitake
- • Fuka Izumi as Saki Murao
The romantic comedy light novel series is written by Yu Hibari and illustrated by Shiso. It was published under Kadokawa Shoten’s Kadokawa Sneaker Bunko imprint from February 27, 2021 to July 31, 2026. A total of 11 volumes were released in Japan. Yen Press recently licensed the light novels for English release.
The series began as a web novel on Shosetsuka ni Naro in June 2020. Its Japanese title is Tenko-saki no Seisokaren na Bishojo ga, Mukashi Danshi to Omotte Issho ni Asonda Osanajimi Datta Ken or Tenbin for short.
A manga adaptation by Kina Oyama was published between September 2021 and June 2025.
Crunchyroll streamed the Oh Boy, Was I Wrong About Her anime series in select countries and territories. It describes the premise as:
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.
Sources: Oh Boy, Was I Wrong About Her Official X/Twitter (2), Crunchyroll News
