A young couple decides to go on a trip to a hot spring run by her husband's brother. Her wife Yuri was looking forward to this day. She has only been married to her husband for a short time. She was a wife who naturally expected sex. but…. Her husband's brother, who is single, ends up allowing his body to enter her body under the influence of alcohol. An unfaithful relationship at a hot spring inn for 2 nights and 3 days. Her brother-in-law keeps asking for Yuri without telling her husband. Before he knows it, he finds himself drowning in pleasure with his stepbrother...