Tonikaku Kawaii: Kaisou

Nasa Yuzaki's carefully planned future changed the night he met the mysterious Tsukasa and nearly lost his life in a traffic accident. When he confessed his feelings, her answer came with one condition: they could be together only if they married.

Years later, Tsukasa appears at Nasa's door to fulfill that promise, and the two become newlyweds almost immediately. From finding a place in each other's routines to learning what marriage actually asks of them, their first days together transform a sudden commitment into a warm relationship built one small memory at a time.