Junior high student Kusakabe Sakura invents a new technology that grants women immortality after they turn twelve. This invention attracts Dokuro-chan, an eccentric angel sent from the future to prevent his success. Rather than using lethal force, she uses her weapon, Excalibolg, to launch playful yet constant attacks designed to keep him too busy to complete his work. Her presence turns Sakura's life into a chaotic cycle of mischief and frequent, reversible physical confrontations punctuated…
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