He has no particular goals and just goes to work. He doesn't even have a girlfriend or friends... He leads such an unexciting life, but then he has to move due to some small trigger. He moves to a new place and finds a high school girl living next door with her mother. She seems to have seen her father as a father figure in him, as she lost her father when she was young. Before he knew it, she was coming over to his house, and the two of them couldn't hold back and started having a physical relationship without his mother finding out, and then...