I'm looking for yaoi mangas that take place in convenience stores, such as "Konbini-kun" and "24 jikan eigyouchuu", also I prefer completed series rather than ongoing onces

sugar milk

Call My Name (JARYUU Dokuro) - The sequel of one of the stories in Sugar Milk also takes place in a convenience store.

Akanai Tobira's Chapter 4 "It's Lonely When You're Cold" starts off with a meeting in a shop and, if I'm not mistaken, one of the characters works part time there.

In Yachin Hanbun no Ibasho desu the main characters work in a store together and often it's included in their interactions, since they get to know each other because of it.

I think there are surely some more, but mainly it's about part time work and the store is not really something, thats completely integrated in the storyline. ^^;

"It's like love is a bonus in your life. Even without it, I'm just fine. I don't feel like pointlessly searching for it. You don't have to make yourself unhappy." (Ookami Shoujo to Kuro Ouji)

"Why does it rain?" - "To create drama." (Drops (Andou Yuki))

Thanks for the recs, I already read "akanai tobira" so I'll give the other two a read