I'm amazed at so many comments, and nobody mentioned how Kashiwada trolled Tabuchi with that swimsuit. I literally laughed out loud at that part. That was probably the best part of this chapter for me.
I also got a kick out of his friends waiting for him outside of the store, laughing at him for actually going inside instead of just waiting outside for them to finish. They knew he would, and could have stopped him, but just wait outside snickering instead, and tell him after he comes out completely embarrassed.