Ryoko works at a dilapidated hot spring inn. She has a past where she left her son. A college student on a solo trip comes to that inn. He was surprised to see Ryoko. It turns out he was the son Ryoko left behind. Ryoko is also surprised and approaches him, saying he's grown up, but she is yelled at not to act like his mother and leaves the room. Late at night, while Ryoko is soaking in the hot spring, he comes in. The two are surprised. However, he gets excited by Ryoko's naked body and attacks her. Ryoko slaps him and leaves the bathroom. After that, he secretly appears in Ryoko's room, saying he's been lonely all along, and sucks on Ryoko's breasts…