1. "Koumanin Asami" is a reference to the Taimanin Asagi franchise. I sort of wound up watching quite a lot of episodes of the Taimanin Asagi "anime" for research purposes. It was very healthy and wholesome from start to finish.
2. The manga Tsuyama is reading is a reference to HanaKimi.
3. I know that a lot of you have expressed concerns about the relationship between Rion and his teacher. But I'm sure that you all feel better knowing that in addition to being a pedophile, Tsuyama is also a total loser.
4. I'm not sure what's going on with the title of the last part. The title suggests that it's about the ten things someone did to win a prize, whereas the actual text is written as commands. I don't know what's going on with that, probably some pop culture reference that flew over my head. Also, to be clear, the use of old grammar is a direct translation of the original, not something that was added by me.