One day at lunch break.
A girl named Sawamura Spencer Eriri hid in a deserted corner and stuffed potato chips into her mouth as if venting her frustration.
"Munch, munch... Damn it! I swear I won't fall for that jerk's tricks and let him tease me again!"
"I've decided! Starting today, every time he teases me, I'll go out for a run that evening, do a lap, and reflect on my actions!"
As she chewed vigorously, pretending the snack in her mouth was the boy who often teased her, the girl made up her mind.
One night, a few days later.
"Going out for exercise again, Eriri-chan?" Sawamura Sayuri asked, watching the girl pull on her sneakers with a mournful expression.
"Yeah..."
"How many laps are you planning to run today?"
"T-ten... fifteen laps..."
