It has been two years since Utsumi and Matsuri graduated, and they reunite at a middle school gathering. Utsumi looks different now, having reverted his dyed hair to its natural color. Matsuri wonders if it was her constant nagging that caused him to change. However, Matsuri still harbors the same feelings for him. She discovers that a girl named Sayaka is responsible for his transformation. Does first love act as a bittersweet poison?