It’s nice having a little sister to tag along...when she isn’t a destructive force of nature! Entrusted to watch over his half-angel， half-devil sister Rin until she comes of age， Ryo does everything that a big brother can to keep her under control. However， when a promise to go shopping with Rin and a long-awaited date with his girlfriend coincidentally fall on the same day， the situation might be a little too hot to handle!