Sakura Kusakabe is fourteen and has invented nothing yet, but in twenty years he will, and the accidental immortality his work causes is enough for heaven to send an assassin after him. Dokuro Mitsukai of the Rurutie order decides distraction beats murder, which in practice means braining him with her spiked club Excalibolg and reviving him afterward. Fellow angel Sabato turns up to do the job properly. This manga continues the Dokuro-chan story from the light novels.