Tonikaku Kawaii

Nasa Yuzaki has planned his future carefully since childhood, until a snowy night brings him face to face with a beautiful girl named Tsukasa and, seconds later, an oncoming truck. Tsukasa saves his life, and despite his injuries Nasa chases after her long enough to confess his feelings. She agrees to be with him on one condition: he must marry her. Years later, on the day Nasa turns eighteen, Tsukasa appears at his door ready to fulfill that promise immediately. Their married life begins before they have ever really dated, leaving the newlyweds to discover love through everyday moments, first arguments, awkward affection, and the mystery of a wife whose past Nasa still knows almost nothing about.