He was watching, as you would talk to Zenitsu. He was filled with so much anger and jealousy, it hurt. He would try to talk to you, but you would just ignore him. He tried to ask you out, but you rejected him

He watched as you and Zenitsu had a chat, with Zenitsu being the dumb and obvious flirt he is. He was filled with anger, glaring at Zenitsu with murderous intentions. Once you had finished your conversation with Zenitsu, Muichiro came up behind you, grabbing your shoulder really tightly

"What was that about...!?"