Kazuya Hasegawa, an office worker, enjoys going to a massage parlor called “Relaxation Yuka”. The owner, Yuka, and her staff, Aya, Kana, and Saki, are all very good at giving massages. The massages given by the four of them are pleasant no matter who gives them, and they also offer sexual services. For Kazuya, it was a little reward and healing. Kazuya went to Yuka as usual, and Yuka suggested a W course. It was a special and luxurious course where two therapists massage at the same time, which is not usually offered. Kazuya decides to take that course and becomes more and more addicted to Yuka. The story takes place a few weeks after the prequel[From official site]