Ayakashi Ninden Kunoichiban

There is a world where shinobi (ninja and kunoichi) are recognized. The story centers around Kaede, who enters Princess Yuri School (Himeyuri Gakuen) and offers assistance to three girls for one year, who happen to be guardians. The top graduate is given a special privilege to become a freelance Shinobi. After entering, Kaede strives to serve a favorite person for one year.