Tenkōsaki no Seiso Karen na Bishōjo ga, Mukashi Danshi to Omotte Issho ni Asonda Osananajimi datta Ken
Manga
Oh Boy, Was I Wrong About Her is a Japanese romantic comedy light novel series written by Yu Hibari and illustrated by Shiso. It was serialized online from June 2020 to July 2026 on the user-generated novel publishing website Shōsetsuka ni Narō, before later acquired and published by Kadokawa Shoten under their Kadokawa Sneaker Bunko imprint in eleven volumes from February 2021 to July 2026. A manga adaptation with art by Kina Ōyama was serialized online by Fujimi Shobo via Niconico Seiga website as part of the Dra Dra Flat brand from September 2021 to June 2025, and was collected in seven tankōbon volumes. An anime television series adaptation produced by Project No.9 aired from July to September 2026.
Description from Wikipedia, available under CC BY-SA 4.0. May be shortened.