If I Press the Switch, I'll Turn into a Girl!?

Keita Toono and Naoya Ayaori, high school boys, are childhood friends. The two boys, both without girlfriends, pray at a shrine for a girlfriend that matches them as well as they do with each other. The deity hears their request, and they obtain a switch that allows them to switch genders...! The two alternate using the switch and change genders and try to get used to dealing with girls, but... What if the male friend you got along with turned into a cute girl!? (Source: Flex Comix, translated)