IOSYS - Usatei (Tewi Rabbit)

We have some more Tewi in here. Some people say it's enough, but I tend to disagree. There are some references to NicoNico videos and so on, see if you can find them. Also, the title is usa (うさ, bunny) + Tei (the way the name Tewi is pronounced), so the result is turned into katakana ウサテイ. It could be read as Tewi rabbit or it could not, whatever.

Lyrics:
http://touhou.wikia.com/wiki/Lyrics:%E3%82%A6%E3%82%B5%E3%83%86%E3%82%A4