Mahou Shoujo Ikusei Keikaku: limited

A whole new batch of magical girls! During what was supposed to be a typical after-school club meeting, a small fairy named Toko appears out of nowhere with incredible news: All seven attendees have what it takes to become full-fledged magical girls! In exchange for their newfound abilities, they promise to save Toko from the evil mages who are hunting her down. But the girls may be in over their heads, as these bad guys have special magical girl powers of their own... (Source: Yen Press)