Yuu is a boy with very bad luck. There are countless incidents where people are held hostage, blackmailed, or involved in traffic accidents all in the span of a week or month. Such a incident occurs when Yuu gets kidnapped, as per usual, on his way to transfer into another school. The lizardmen, bring Yuu with them into the underground aqueducts. Yuu is scared and desperate to escape, but then a girl appears to save him. The girl is a non-human cat girl who can control the power of electricity and she tries to rescue Yuu, but then an incident occurs! The appearance of a very dangerous and troublesome enemy, known as "Makatsuhi" (マカツヒ), which is a monster that'll attack and kill anyone! Yuu tries to escape when the girl goes to fight the Makatsuhi alone, but then he steels his resolve and goes to try to save her, and after this encounter his life changes...