The main character Mizuho is a nice guy..(You will not notice it in the beginning but in the later part you will see he really is a guy)..who was born in a good family, smart, and moral. But one day, he has to transfer to a girl’s high school by his grandfather’s last will. Then, he has to disguise like a girl to go to the school…he became the elder and really looked like a beautiful girl who is elegant gentle..kind and many more...but some people found out about him being a guy and disguising as a girl..
After Mizuho's grandmother passes away (his parents are gone also), it is in her will that he go to an all girls' school and stay there for a while in order to get the inheritance. With the help of his childhood friend Mariya, he turns into a fair young lady and attends the school, until he becomes very popular and is elected as the Elder sister, and not everyone doesn't know his secret.