Mahoutsukai Precure! EP4 - Magic Lesson Start! Search for the Mysterious Butterfly!

After being told about the Linkle Stones by the Headmaster, Mirai and Riko, along with three other students: Jun, Emily, and Kei, begin taking supplementary classes, which they must pass in order to avoid repeating the year. Their first test involves chasing down paper butterflies before they get soaked by roaming rainclouds. As the other classmates manage to catch their butterflies, Mirai chases after hers into a constantly shifting labyrinth of bookshelves, where she is attacked by another of Dokuroxy's minions, Gamets, who summons a Shark Yokubal. After Mirai and Riko reunite with each other, they are drawn towards a particular book before transforming to fight the Yokubal. After the girls defeat the Yokubal and retrieve their butterfly, the book they found transforms and gives birth to a small baby fairy.