ryoujoku hitoduma onsen

The main character is a uni student who starts to work at an old spa hotel part time. The owner of the hotel is his relative and she is an widow. She is still young and beautiful so he tries to have a close relationship with her. One day, there comes three beautiful customers. They are all married and are going to stay there for the next two weeks. He starts to take an action to approach them, chat them up and have an erotic life with beautiful wives....