Takuya was addicted to horse racing, hiding it from his wife. He hits the jackpot and goes to a high-class soapland... where he unexpectedly bumps into his wife's mother! "Mother-in-law?! Why are you here...?" "What! Takuya?! Please keep it a secret from everyone!" He is shocked and speechless at the hidden side of his mother-in-law that he didn't know... "If you keep it a secret, I'll give you plenty of service." Takuya nods in response to the invitation from her voluptuous, busty body, and the soapland technique with the highest request rate invites him into an unprecedented world!