I've been looking for this forever and I really can't remember the title of this story, probably but not surely a one shot.

An older man wait for someone with a bunch of flowers, maybe roses, when a younger man pick him up and convince him to go to a date at an amusement park. The older man is pretty cool, in a suit, divorced and the person he was waiting for was his young daughter. The younger man is more fashionable and I remember that at some point he cried. At the end the older man wait again with flowers but this time they are for the younger man.

Anyone have any idea which manga it is? Or was my description too vague?

Thank you for taking time to look whether you answer or not, though!

English is not my primary language so excuse me if I made some errors.

It's probably "Show Me Heaven" (from Bannin) by Kunieda Saika.

And you write very well in English!

My savior! Yes this is the story I was looking for! Thank you so much!