Yui is a married woman with a kind and hardworking salaryman husband. Her brother-in-law, currently unemployed, is staying at their home while desperately searching for a job. Witnessing the happy couple up close, he begins to see Yui in a special light. One sweltering tropical night, seeing Yui drenched in sweat, her alluring figure leaves an intense impression on him. Overwhelmed by her beauty, his uncontrollable desire begins to surge within.