Danshi dato Omotteita Osananajimi to no Shinkon Seikatsu ga Umaku Ikisugiru Ken ni Tsuite

Shuuichi and Yuika have been close friends since they were kids. But Shuuichi had always thought Yuika was a boy, so their reunion 10 years ago was filled with surprise when Yuika had seemingly transformed into a beautiful young woman! Intimidated by his friend's beauty, Shuuichi was sure this would be the end of their friendship. And it was... because the two traded in friendship for marriage! A sweet and charming love story about finding friendship and love with your person. (Source: Seven Seas Entertainment)