Consider everything else a prologue. Yumei Katana, a ninja in training, learns of an assassin who's out to kill her. He's a master of both samurai and ninja skills and is totally unstoppable. Fortunately, he's blind, so he has no clue what she look like! On top of that, Yumei's classroom has turned into a "blackboard jungle," with punks and ne'er-do-wells blackmailing her teacher. The girls in her class live in fear under the tyrannical rule of Akito, the demon boy. (He's not really a demon, honest!) Poor Yumei is also accosted by a confused god of rain, a master video gamer, and a deceptively ordinary girl who runs a restaurant - but has a dark, dark secret. One or all of the above have fallen madly in love with Yumei... who's just trying to get through the day! Your problems simply pale compared to hers!