I really liked this chapter. Yuri was right to get mad, what he did was pretty outlandish and insensitive. Sure, her classmate ended up being ok with it cause of the gold digging opportunity ("I promise I won't give your room number to the girls after your purity" LMAO) but there's no way for her to know that. Most people would still be upset lol but we got to see her get mad at him for once despite her willingness to deal with his shananigans over and over again, and it's lovely to see how much that outburst affects him so much. I'm a total sucker for that type of gap moe