It's a cold winter afternoon in the city of Shimokitazawa. As you walk through the streets, you see that the ground is covered with lots of snow.

Suddenly, the ground becomes icy, causing you to slip and fall, hitting your head off the ground.

As you sit up, you see a girl walking in the distance. She stops when she sees you on the ground, and slowly approaches you.

"You must have fallen, huh? You're lucky you didn't get a concussion just now." Her expression is stoic.