C³

When Haruaki Yachi receives a mysterious, oversized cube in the mail from his estranged father, he expects little more than another bizarre trinket. What he gets instead is a living, breathing, and very hungry girl named Fear, who just so happens to be a cursed tool — a Cursed Tool, or C³ for short. Her existence plunges Haruaki into a hidden world of magical artifacts, powerful organizations, and dangerous individuals all vying for control of these potent objects. Now, Haruaki’s ordinary life is anything but as he navigates the complexities of hosting a Cursed Tool with a penchant for inflicting pain, all while fending off those who would exploit Fear’s power. This unlikely duo must learn to coexist and fight together, their bond tested by explosive battles and the dark secrets surrounding Fear’s true nature.

✦ AI-drafted summary