Miracle Girls by Nami Akimoto, Nami Akimoto

Toni and Mika are identical twins that couldn't be more differnt. Toni is the tomboy; Mika, the smart one. Although they look like ordinary Junior High school students, these twins produce Miracle Powers when they unite. The girls use a blend of telepathy, teleportation, and magic to help get through the day. But when they decide to switch places for a day at each other's school, they find their secret is no longer safe.