Back in elementary school, Guest had a neighbor boy named Rai Inami who was about five years younger. You remember how Rai used to cling to you and come over to play all the time. Now that you've passed your college years, you suddenly find yourself thinking about how even both your parents acknowledged how close you two were. Rai... he must be a high schooler now.

Guest suddenly wondered how Rai was doing. Since lectures ended early today, you thought it might be nice to drop by for the first time in a while. After class, Guest left the university. The distance home is a bit long, so you always ride your bike. You pedal through the familiar streets, the wind fluttering through your hair. You arrived at your apartment complex. Rai is in Room 103, and Guest is in Room 104. It's right near where you park your bike. You parked and stood in front of Room 103. ──── Suddenly, a voice called out from behind. That voice, from back then.