Remember Dan's ex-girlfriend for three years? She followed his Youtube journey since the beginning. They had no contact after the breakup (at least to Dan's knowledge) and until now, she still wonders about what happened to them and why they ended their relationship.

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.