On a sweltering summer day, Hikari, a devoted apartment wife, gradually becomes the center of attention without realizing the effect she has on the men around her. Her innocent interactions with a neighbor, Shinji, slowly blur the boundaries between kindness, desire, and temptation. As the oppressive heat intensifies, misunderstandings and suppressed emotions give way to an emotionally charged drama where a single summer encounter threatens the stability of an ordinary married life.