Sakura Kusakabe, a mere junior high student, has committed a horrible crime. Or, rather, he will commit a crime-20 years into the future. The crime in question? He will prevent all women from developing past the age of 12, with immortality as an unintended side effect. As a result, the angel Dokuro Mitsukai is sent from the future as an assassin, armed with a magical spiked bat named Excalibolg and any time Dokuro would kill Sakura she used her "Pipiru piru piru pipiru pi" magic to revive him