From Whitelies Fansub:
Hasegawa Mitsuki, a college freshman. Mitsuki has been thinking about the same person since she was 16 years old. That person, being 18 years older. A Coffe Shop Manager, Asai Ryusei, a divorced man with an only son.
To Mitsuki, Ryusei is a really important person but, her romantic interest for him is slowly...?!
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