Futari de Marvel Shichaimasu! ~Kinou no Teki wa Kyou mo Koibito!?~

Main character gets to protect two girls from molesters on his way to school. Next day these girls join his class as transfer students and even get seats next to him. A fierce battle for his attention continues each day. At the same time PC components shop owner asks protagonist to defend the world from evil forces. He is supported by transfer students who turn out to be justice sailor warriors. The competition between girls comes to the new stage with their supernatural forces revealed.

[From vndbreview]