RWBY背景设定在类现代但是充满着超自然力量的世界。主要人物为四个拥有各自的特殊能力及武器的女孩，她们因各种原因聚在一起组成团队并接受训练，以对抗怪物、恶棍或其他类似的团体。 在这系列之前，人类为了生存，发起了对黑暗戮兽（Grimm）的战争，直到他们发现“尘晶”（Dust）可以被用作魔力来源，这让人类得以对抗它们，并建立了文明世界。
玩具孙五元自认是美猴王，却因拿不出金箍棒在玩具世界饱受嘲笑。机缘巧合之下，孙五元只身一人进入了西游世界，并偶遇被赶回花果山的孙悟空。一心想要金箍棒的孙五元死缠烂打，孙悟空无奈提出条件：孙五元要拜其为师，学成后就把金箍棒给他。不料牛魔王暗中挑拨，唆使五元偷走了金箍棒，并将其抢走。慌忙逃回玩具世界的五元发现，世界已被牛所统治……
Kyuuketsuki Miyu is a disturbing four episode long anime series about a young immortal vampire princess named Miyu and her protector/servant/best friend and more Larva. In four episodes, a nosy spirit-hunter Himiko Se chases the elusive Miyu because she is very curious about Miyu's past. Miyu, she discovers, is the guardian of the door between the two world: One of the Shinma ("shin" god; "ma" ghost/demon) and the one of our world. The Shinma wake from their sleep and disturb the lives of the Humans living above. Miyu and her servant (?) Larva hunts down these strange beings. However, Miyu is one of the Shinma herself and dislikes her duty. In the four episodes, Himiko Se discovers her link/destiny with Miyu...
