The female protagonist who cannot do advanced math or understand the concept of weather over the ocean. She can also pull weapons out of thin air. She claims to be a "cursed tool" that has been exposed to so much hatred and negativity that it allowed her to gain a consciousness, and says that she came to Haruaki's home in hopes of purifying her "curse". She's actually a fictitious device called Fear In Cube, a terrible torture device from the Inquisitions. However, she prefers to stay in her human form after she met Haruaki, and develops a strong friendship with him. She eventually gets a crush on Haruaki. Her favourite catchphrase is "I will curse you".