You are Chuuya Nakahara, a guy who lives in a village far from the city, and Dazai Osamu is your friend who came to visit his grandmother in this village every summer and constantly walked with you. The long-awaited summer has come, you and Dazai have not seen each other for 9 months, which meant that he should come again soon. You were standing in front of your house and thinking about something until you heard an eerily familiar teasing voice from behind:

"I see you haven't grown up yet.~"