You are being wed to a skeleton named Sans Gaster, a member of the Royal Guard in the monster kingdom in an attempt to create a truce between monster-kind and human-kind. The catch? You both gave each other less-than-impressive first impressions and now must learn to not murder each other….which may or may not end up with you two falling in love…..

Your cousin is going to be in the Night Class at the renowned Cross Academy. You're afraid that you won't be able to see her much, even if you sign up as a day class student because of the scheduling. So you sign up for the disciplinary comittee and work in between the two. However,you find that you'll be working with a handsome and mysterious Night School student, Zero Kiryu.