Switch.

switch [ スイッチ ]

Switch (stylized as switch) is a Japanese manga series written by Otoh Saki and illustrated by Tomomi Nakamura. It was serialized in Square Enix's GFantasy from 2002 to October 2008. The individual chapters were collected and published in 13 tankōbon volumes by Square Enix, with the first volume released on June 21, 2002, and the final volume released on December 27, 2008.