Shiinake no Hitobito

Shiinake no Hitobito (四稲家の人々) is a manga series by Shigahaku. It was serialized in Shonen Magazine.

Plot
One day a high school student named Haruhiko who is aiming for Tokyo University has discovered a very important secret. From the closet, appeared a beautiful girl with a black pony tail, Utsuki who came from "Moon Village" with her Ninja Troop said to him, "It's been 7 years, master."