Mikazuki to Nagareboshi

Hasegawa Mitsuki, a college freshman, has been thinking about the same person since she was 16 years old—an 18 years older coffe shop manager, Asai Ryuusei, a divorced man with an only son. To Mitsuki, Ryuusei is a really important person but, her romantic interest for him is slowly...?!

(Source: Whitelies Fansub)