在名为四皇町的街道中，一名正在读高中二年级的普通少女立华（配音：茜屋日海夏）与母亲共享了平凡生活。 sudden encounter with the student council president, Leim (配音：齐藤壮马) , led her to the student council's secret base, the Third Library. There, a gateway to an alternate world stood before her, opening up a realm where demons, vampires, and exorcists engaged in intricate power struggles.
Surrounded by anthropomorphized monsters such as the charismatic Uzel (配音：近藤隆), who was known for his sweet talk among women; the boisterous but delicate-hearted Nagatsuke Meiji (配音：木村昴); and the quirky art enthusiast Kuzuryū Sairi (配音：平川大辅), how would Litua's story unfold amidst these magical creatures? The adventure was about to begin!
