Yukari Nejima, a student who has been in love with Takasaki since he interacted with her in 5th grade, but will turn 16 in one week. Misaki Takasaki, a student who has been in love with Nejima since he gave her a eraser back in 5th grade. These two students live in a world where love is forbidden due to the Red String System, a system that was made by the government that arranges life partners at the age of 16. Will Yukari confess before he turn 16? Who will his life partner be? What will happen next?