Second summer since getting married, Asuka lives with her husband's family to take over their business. Her brother-in-law, burdened by overwhelming debt, returns home, throwing their relationship into turmoil. Under the oppressive heat that stirs their emotions, a moment alone together awakens uncontrollable instincts. Their flushed bodies, locked gazes, and dripping sweat are vividly captured. Though initially hesitant and resistant, the two cross the line into forbidden intimacy—and the next day, their passion shows no sign of cooling down.