The mistaken identity childhood friend premise is cute—discovering your childhood friend who you thought was a boy is now the class idol creates perfect rom-com potential. That title is impossibly long but the premise sounds fun; Japanese light novel titles keep getting longer, but this one delivers exactly what it promises. Childhood friend rom-coms are always sweet; the established bond from the past adds emotional depth to the romance. The class idol reveal sounds like classic shoujo setup—perfect grades, athletic ability, and good looks meeting the oblivious childhood friend hits all the tropes.

The upcoming TV anime based on the romantic comedy light novel series Tenkousaki no Seiso Karen na Bishoujo 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) published a new teaser trailer and teaser art today. The series will broadcast in Japan in 2026.

WATCH THE SECOND TEASER TRAILER: TenBin Teaser Trailer 2

Tenkousaki no Seiso Karen na Bishoujo ga, Mukashi Danshi to Omotte Issho ni Asonda Osananajimi datta Ken teaser art

About the Series

The series was originally published on the Shosetsuka ni Naro website beginning in June 2020. KADOKAWA publishes a print version under their Kadokawa Sneaker Bunko imprint, and nine volumes have been published in Japan to date.

Yu Hibari writes and Shiso illustrates the series.

Fujimi Shobo also publishes a manga adaptation with artwork by Kina Oyama.

The Story

The story 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.

Production Details

The main staff for the TV anime adaptation has not yet been revealed at the time of reporting.

Premiere Information

Date: 2026

Are you excited for this rom-com? What do you think of the childhood friend premise? Do you prefer mistaken identity or straightforward romance? Will you use the shortened TenBin title? Share your thoughts in the comments below!