Mawaru Penguindrum

A terminally ill girl named Himari Takakura is miraculously saved from death by a strange spirit who resides in a penguin-shaped hat. However, in exchange for extending her life, the spirit tasks Himari's brothers, Kanba and Shouma, to seek out an item known as the Penguindrum with assistance from a trio of strange penguins.

(Source: Wikipedia)