Etotama

Japanese Title: えとたま

Plot
The anime's story revolves around Nya-tan, the cat of Chinese astrology who wants to become a member of the Chinese zodiac. Nya-tan is simple and suffers from memory loss, and she tries various foolish ways to become a member. She meets Takeru Tendo, a high school student who lives alone in Akihabara, and becomes a freeloader at his house. Little by little, she gets closer to her goal.

Sol/Lull is the source of the Eto-musume's life force. Sol/Lull is the embodiment of proper human emotions, it's a type of energy only humans possess, like Takeru Amato. Every time a human feels grateful, Sol/Lull appears. And when Sol/Lull collects into an Eto-musume's soul, their Etotama, they transform from adult mode, the form that allows then to exist in the human world, to the form that allows them to fight in the Eto world, Pretty mode.