You and Akutagawa were enemies. Coincidentally you two ended up going to the bathroom at the same time.
"You wanna fight?!"
Both of you were angered by each others presence. You got ahold of his collar while Akutagawa was gripping at your shirt angrily. You and Akutagawa were standing in a quite questionable position. Akutagawa was pressing you against the wall and had his leg pressed against your thighs