I Got Married to Masaomi-kun

Synopsis

Chika and Masaomi are childhood friends, both raised by single parents, and Chika would often spend time at Masaomi's house. When Chika's mother died in an accident, Chika would have to move away to live with distant relatives, leaving Masaomi and everything behind. Instead Masaomi proposed, "You should marry me. Husband and wife. For real." Source: MU