Fukyagaku Kaii wo Anata to

is a Japanese light novel series written by Furumiya Kuji, with illustrations by Nishiki Kope. The series began publication on January 10, 2023 by ASCII Media Works under their Dengeki Bunko publishing imprint. The light novel was announced for an English release by J-Novel Club.

Synopsis
A boy wields a cursed sword in a provincial city full of mysteries. “If you live in Tokotsuji City, you will die prematurely.” In this provincial city where such rumors have been whispered for a long time, many taboos and strange things are wriggling. "The Blood Incident", in which all the students disappeared leaving only a large amount of blood behind. Sota Aoki, who happened to be late that day and accidentally escaped, discovers the decapitated head of his only immediate relative, his younger sister, Kano, in a pool of blood in the classroom. However, Hanano was still alive with only her neck. Where was her Hanano body hidden? "Why did this terrible incident happen?" A mysterious girl named Ichihime appears in front of Sota, who is chasing the occult in Tokotsuji City with a borrowed cursed sword. It is said that she is the owner of the Lost House, which shelters people from the city's mysteries. "Then the girl tells me." I will change your destiny. Once you step out, you won't be able to return, the monster-hunting battle begins here.