Along with Karin, Anna is one of Ririka's best friends.  They are in the same 4th grade class together at White Dove Academy (白鳩学園) and hang out together regularly both at and away from school.  Anna is a very shy, reserved girl and always speaks very politely even to her friends.

The Evil Forces of Dark Joker are closing in on our planet after having destroyed the beautiful planet of Queen Earth. Now, 10 year old Moriya Ririka, with the help of her childhood friend Seiya and the mysterious Kanon, must transform into the Nurse Angel and find the elusive Flower of Life, the only way to defeat the evil forces. The Flower of Life, that once bloomed all over the Earth, is where no one thought it ever would be. And Ririka must make the hardest decision of her life in order to acquire it and rid the universe of evil once and for all.
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(Source: Anime News Network)

Ririka is an average student that can, in fact, transform into "Nurse Angel" by using a special nurse-like hat given to her by her senpai Kanou (who is, in fact, from another dimension/world connected to this one). Ririka's fellow classmate and neighbor is Seiya, who follows her and helps her as much as he can. Aside beating evil monsters.

Anna Kazami