Conveni de Deatta Eroi Onnanoko to Tadarekitta Kankei ni Narimashita.

"Onii-san, it seems like you come to this store a lot, don't you?" Tomoya's nightly visits to his local conbini aren't for snacks. He's there for the girl who shows up every night. When they finally talk, it quickly becomes clear that she's looking for some fun, adult fun.