uhmm's manga / #ex-lover(2)

Guy becomes the next leader of a fireworks shop and some dude randomly shows up and is like omg no shigue (grandpa) don't retire and he is supposedly the grandpa's ex-lover but is about the same age as the grandson. He too loves fireworks and wants to contribute and improve shigues legacy.

Rival idols who used to boink are forced to live together to make their movie debut natural