Oribeya Sumito, a good-natured office worker, attends a blind date with his business partner. After the breakup, he decides to let a beautiful woman, Rainako Sewaya, stay at his house after she misses the last train... She was such an extreme cleaning fanatic who loved dirty rooms! Possessing lots of health knowledge, the inevitable fainting in agony Kamaware DAYS, with ecchi start beautifully and squeaky clean! (MTL)