Two couples are currently facing each other in a hall with a mysterious atmosphere. One is a husband in his forties and a wife in her thirties, and the tension is palpable. On the other hand, the husband appears younger, and both give off an air of familiarity. Following the lead of a man named Sasaki, who introduces himself as the manager, they switch partners and enter the playroom. The rooms are divided into a Japanese-style room above and a Western-style room below, and a mutual non-interference policy...