Office lady Yuria lost her parents at a young age and lives with her younger brother. One day, she discovers that the woman her brother has been dating is actually a married woman—and her husband is demanding a huge sum in damages. Desperate and short on funds, Yuria accompanies her brother to the woman's home to apologize. However, the man who appears there is none other than Yuria's most detested direct supervisor. From that day on, Yuria is forced into a fate-changing life as a substitute sex slave and cumdump...