Sen to Man - Vol. 2 Ch. 20

[MangaDex]

 

[Nakayuki]

Just mix it and fuck those who think is weird :v

 

[thedestroyership]

WOAH A MANGAKA WHO UNDERSTANDS THE BEHAVIOUR OF YOUTH!!!

 

[Kaarme]

WOAH A MANGAKA WHO UNDERSTANDS THE BEHAVIOUR OF YOUTH!!!

Almost makes you believe the mangaka was once young herself.

Seriously, though, I imagine she has a family and some of this is based on real behavior, with the names changed to protect the privacy of the people involved.