Double Reaction! Plus

The story is overall the same, though. The female protagonist, Yuri, is jealous of her good looking twin brother, Kairi. One day she comes to a wishing stone and picks it up wishing she is good looking and sexy, but drops the stone and breaks it in pieces. A couple of weeks later, she wakes up one day realizing she doe no longer have her body. Something happened and made her and her brother switch the bodies. Now she has to go to school pretending she was her brother and vice versa until whatever enchantment was placed upon them wears off or they figure out how to lift it.