Tenkō-saki no Seiso Karen na Bishōjo 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, "The Neat and Beautiful Girl at My New School Was My Childhood Friend Whom I Thought Was a Boy and I Played Together With") is a Japanese romantic comedy light novel series written by Yu Hibari and illustrated by Shiso. It began serialization online in June 2020 on the user-generated novel publishing website Shōsetsuka ni Narō. It was later acquired by Kadokawa Shoten, who have published seven volumes since February 2021 under their Kadokawa Sneaker Bunko imprint. A manga adaptation with art by Kina Ōyama has been serialized online by Fujimi Shobo via Niconico Seiga website as part of the Dra Dra Flat brand since September 2021 and has been collected in four tankōbon volumes. An anime television series adaptation has been announced. Source: Wikipedia (en)