It is said that this world can sometimes be connected to another world that gives you chills. Haruto Kiyoi, the head of Kouou Academy's public morals committee, chases a student who has broken into the old school building and stumbles into a nest of monsters. Even though they are in a desperate crisis, a boy named Ruki Ouma, who calls himself the "underground" discipline committee member, suddenly appears...!? A school horror story in which two discipline committee members fight against the darkness begins!!

Nina is an angel of love (Cupid), but she doesn't want to be rewarded for her work, as it's better to die than to work overtime. In order to make the client's love written in the love consultation app come true, she shoots a love arrow (however, since the bow and arrow are a nuisance, she uses a sniper rifle), but of course the priority is to go home and play games!