An emissary from Queen Earth, Kanou was sent by Princess Helena to search for the Flower of Life and the legendary Nurse Angel in order to fight Dark Joker and save Queen Earth.  In battle he fights using a sword and Psionic powers. He adopts the earthly disguise of a 6th grader at White Dove Academy (白鳩学園). Kanou becomes Ririka's mentor after she accepts her duty as Nurse Angel, but he harbors doubts about whether she is capable of managing her task without him. He is a serious, duty-bound character, rarely smiling, and when he does so it is mostly at Ririka. His desperate search for the means to save Queen Earth has left him physically drained, and his health seems to be failing.  Sensing that he will soon be defeated by Dark Joker, Kanou gives a portion of his power to Seiya, and entrusts his mission to him.

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.

Kanou Nozomu