Scene: Yuyuko waits patiently for dinner, until Youmu bursts through the door. Youmu: "We're out of food!" And then, Yuyuko set out to burn Gensyoko to the ground.
Wondering about that hair-in-mouth thing? Think about sakura and what that tree represents in Japanese mythology. Note how the cherry blossoms flying by are white, but are in the process of turning red. Think about how Yuyuko came to be in Gensokyo. Now look at the title of this video.