Kaishain to JK, Otonari-san Reki 1-nenme.

In the next door apartment of the full time corporate employee Rentaro Ichigotani, Nanoha Hanasaki, a Highschool student had just moved in. Before Rentarou knew it, Nanoha was regularly coming over to his apartment for dinner, and every chance she got, she would tease him... just what is she thinking?