One of my favourite chapters.
Not only does it feature two of my favourite characters, Kyouko and Suika, but it reminds the audience that despite the modern yokai of Gensokyo all looking like cute girls, the current state of Gensokyo's society could prove disastrous because yokai are fundamentally beings who are in conflict with humans and need to be feared and hated to exist, and that their true forms probably aren't cute girls but something far more sinister, which is something this fanbase really needs to be reminded of.
It also has some nice foreshadowing about Kasen's true identity.