Danshi da to Omotte Ita Osananajimi to no Shinkon Seikatsu ga Umaku Ikisugiru Ken Nitsuite (Associated Names)

Shuiti, a high school student, ended up marrying his childhood friend whom he originally thought was a boy. When they reunited 10 years earlier, his childhood friend Yuika had transformed into a beautiful girl, which initially made Shuiti quite nervous. However, as time passed, he gradually grew accustomed to the sense of closeness as best…