Responses
I only remember this one-
https://www.mangago.zone/read-manga/blue_blue_blue/
I'm sorry, it's not it. (￣∇￣") But thanks for helping. (≧∀≦)
I think I found it. https://www.mangago.zone/home/mangatopic/16542103/
At the beginning of the story, the MC guy was probably forced by his mom/dad/parent(?) to work at a relative's (probably his uncle's) place which is something like a bar/diner/restaurant. At least, I'm sure it has something to do with him working at a relative's place and a parent.
Although, for the next clue, I'm really not sure about this and my memory of the manga might be mixed up with other manga. I think the ML guy has a motorcycle.
It's a black and white manga, by the way.