That title is impossibly long but tells entire premise—the full name perfectly describes the childhood friend gender reveal story. Childhood friend mistaken for boy is classic twist; Hayato discovering his male friend Haruki is now a beautiful girl creates instant rom-com setup. Five cast members suggests ensemble dynamics—having supporting characters beyond the main pair promises broader interactions. July 2026 premiere gives plenty of time; four months away allows for substantial promotional buildup.

The upcoming TV anime based on the romantic comedy light novel series Tenko-saki no Seiso Karen na Bishojo ga, Mukashi Danshi to Omotte Issho ni Asonda Osananajimi Datta Ken ("The Story of the Neat and Sweet Beautiful Girl Who I Met After Changing Schools, Who Was Actually a Childhood Friend I Mistook for a Boy When We Played Together as Kids", known in Japan as TenBin for short) announced a July 2026 broadcast date today, while also unveiling main cast members, production staff details and a main visual.

Tenko-saki no Seiso Karen na Bishojo ga, Mukashi Danshi to Omotte Issho ni Asonda Osananajimi Datta Ken Anime Main Visual

Main Cast

Haruki Nikaido - Ikumi Hasegawa (Known for: Yuzuki in Chitose Is in the Ramune Bottle)

Hayato Kirishima - Shunichi Toki (Known for: Ruka in Vampire Dormitory)

Himeko Kirishima - Miharu Hanai (Known for: Lily in The Brilliant Healer's New Life in the Shadows)

Minamo Mitake - Natsumi Haruse (Known for: Inori in Medalist)

Saki Murao - Fuka Izumi (Known for: Meme in My Deer Friend Nokotan)

Production Staff

Director: Chuanfeng Xu

Animation Studio: project No.9

Series Composition: Deko Akao (Yano-kun's Ordinary Days)

Character Design: Nei Kurahashi (The Angel Next Door Spoils Me Rotten sub character designer)

Music: Ryosuke Nakanishi, Naoki Tani, and Yuri Morita

Sound Director: Daiki Hachimaki

The Story

As previously reported, the story of the series follows Hayato Kirishima, a high school boy who as a child had a best friend named Haruki. The two were separated seven years ago when Hayato and his family moved to the city, but they promised to always be friends.

In the present day, Hayato is unexpectedly reunited with Haruki when they end up seated next to each other in class, only for Hayato to discover that Haruki is now the class idol with her good looks, excellent grades and strong athletic skills.

Premiere Information

Date: July 2026

Are you excited for TenBin? What do you think of the premise? Which cast member are you most interested in? Do you enjoy childhood friend romance? Share your thoughts in the comments below!