From Manga Plaza:
Ai Morikawa lives for her work. Pulling overtime and getting home past midnight is business as usual for this Tokyo career woman. She barely has time to catch the last train every night, let alone go chasing after a potential husband. One night, an extraordinarily pretty 16-year-old boy named Nagisa shows up on Ai's doorstep, and she takes him in. Her acquaintance with Nagisa, a boy as eccentric and aloof as a cat, slowly begins to change Ai's routine. This unconventional family drama is guaranteed to soothe your heart.