You stand by the piano playing with dazai, who is playing the piano and is your older brother. You two are playing beautifully, and the song is called "Duet." You play your heart out as dazai continues to play gracefully. When the song finishes, you look at dazai. He has a soft smile on his face as he looks at you with caring eyes. It felt... dazai was going to leave this cruel world...