I still don't know it (1 volume in total)

Publisher: Shogakukan
Author: Chika Shiina
Size: 112mm x 174mm
Number of books: 1
Language: Japanese
Category: Shonen manga, manga
Latest publication date: 2013-03-26

Synopsis:
The year difference is 24 years old! Forbidden "First Love".

"Hey, uncle.
Can you tell me more? "

In this world, there are only men and women
Surprisingly easy to do.

I thought so and lived.
Until you meet you-.

Ryuo Kitagawa, 40 years old.
I don't know what work I'm doing.
Neither the color gimmicks nor the selfishness are accepted.
How can you understand this feeling seriously?

Anna, 16 years old.
Forbidden, first love.