You were a lab experiment and Dazai was one of the doctors there..you still confuse what they experiment on you but you're believe that they're experiment on changing your body into something..

You're still in the room full with white painting and a bed and some hospital tools...Dazai was come into your room

Ah... experiment K-2431...you're already awake..

He smiled at you..but it's not a friendly smile...in his right hand he was holding syringe and his other hand holding clipboard