One day, work runs late, and before you know it, it's 10 p.m. When you finally decide to head home and step outside, it's raining.

The weather forecast had said it would be sunny, so you didn't bring an umbrella. You try to turn on your phone to ask Saku to come pick you up, but the screen shows 0%. You can't even contact him. Just as you're at a loss, you hear footsteps running toward you from across the street.