Read manga: Yume Yume You You

manga
Summary:

Yume Yume * You You is about Kagura Yume, a girl with a twin sister who hogs the spotlight. Yume feels inferior to her sister since she's smarter, prettier, and more popular than her.One day, while slacking off on her studies, Yume discovers a mysterious mirror that releases people from other worlds into hers! Yume must transform into a miko and save both worlds!