Not much is known about the storyline for the anime series, but fortunately Dengeki.com recently posted an article:

"The main character, Natsume Tomoharu [Irino Miyu], takes the opportunity to live on his own when he enters high school. Although he appears to be a normal high school student at first glance, there is one thing about him which isn't normal. He's haunted by the ghost of a young girl, Minakami Misao [Tomatsu Haruka].

Tomoharu moves to his new place of residence, Meioutei, and starts enjoying a carefree high school life. But this is all ruined when a beautiful girl named Kurosaki Shuri [Tanaka Rie] appears with a trunk which Tomoharu's brother told her to pass on to Tomoharu. The presence of the trunk causes the appearance of Takatsuki Kanade [Nonaka Ai], a girl dressed like a shrine maiden who is after the trunk.

Because Tomoharu is in possession of the trunk, he will come face to face with the the hidden truth of this world."