Otome is the main heroine in the game and one of Jun'ichi and Nemu's granddaughters. She is the student of Kazemi senior high class 2-3 and the chairman of the student council. She refers to Yoshiyuki as "ototo-kun", meaning "little brother". Otome inherited her father's magical abilities. Otome seems to be one of the two persons, besides Sakura, to have known that Yoshiyuki was created due to the a wish upon the Sakura tree. It is not clear whether Otome's feelings for Yoshiyuki are that of a brother or more but in the second season it was hinted that her feelings for him are greater than that of a brother.
Source from Wikipeida