As a junior high student, Sakura Kusakabe had committed a terrible crime, or rather, he was going to commit one two decades from now. His heinous act involves ending the growth of women beyond the age of 12, and unintentionally give them eternal life. The angel, Dokuro Mitsukai, is sent from the future armed with a magical spiked bat named Excalibolg to assassinate him, but instead of killing Sakura, she opts for a new strategy. Dokuro resolves to frustrate and distract Sakura to prevent him from creating the criminal technology. Despite excelling in her disobedience, Dokuro’s approach leads to the dispatch of Sabato, another angel tasked with completing the mission. The impulsive Dokuro, who has a habit of killing Sakura with her bat and reviving him with the magic words, "Pipiru piru piru pipiru pi," and the electric baton-wielding Sabato turn Sakura's life upside down, and peaceful days seem like a distant memory.