Osananajimi to Kanojo to

Rui, an unremarkable high school student, somehow ends up having as his girlfriend Miya, a stunning beauty admired by the entire school. However, just then, his childhood friend Ayana, with whom he had grown distant, reappears and starts to shake things up for him. A sexy suspense story of wavering between a childhood friend and a girlfriend!

(Source: Futabasha, translated)