• Alright, fifteen days until the school ends, Minoru Izuki thinks while walking to Trig.

    It seems that we were fated to meet, Tsukasa Ryuugai writes on her paper as he walks in.

    Minoru Izuki is a low-grade student with low standards, because he's bored out of his mind. A mysterious girl comes to his Trigonometry class 15 days before school ends; and her lurid voice captivates him. Join him as he tries to make it through the last days of school, alive.