One late summer day, Yui was living in an apartment with her husband's parents. To her surprise, her brother-in-law suddenly showed up, having lost his job. Unaccustomed to family life, his presence began to disrupt Yui's daily routine. One sweltering tropical night, while the family was away, the brother-in-law crept up on Yui, captivated by the sweat glistening on her body. A tense and unsettling night unfolds, charged with warmth and unease.