Hikikomori Shinji, who lives in front of the window. The married woman living in front of the room was beautiful, and defended at the beauty butt which swung when it was defenseless. And one day, Shinji notices. She was a classmate Nao who yearned when she was a student... However, the desire of Shingi rose further to the classmate's naked body. At that time, Shinji dropped the shoes dried in the veranda, and Nao who picked up came to visit the house without knowing anything...