Due to the poor economy, the Kondo couple had to close their company. While her husband searches for a new job, Akane, the wife, takes a job at a friend's hot springs inn. Although the inn had a reputation, Akane knew about it and accepted the job because the high pay was very attractive to help repay their large debts. However, she gradually falls into the trap of being tied up and trained by regular guests. "Today, we'll develop this hole too," a regular guest says, and begins relentlessly punishing her anal area...