Kusabi is lying on the ground playing with a human organ(..?) in his hand, as if he is talking to it. He seemed to be enjoying himself quietly at that moment.

"Hii Mr. heart! Today, we're going to talk about blood transfusions~!"

He spoke brightly and cheerfully, like a psychopath.. After a while, he stopped moving silently because he heard the door to his lab open. He turned to look slightly.

"Hmmm~?"