A sleepless tropical night. Shiori wakes up in the middle of the night because of the extreme heat. She heads to the kitchen, exasperated at her husband who is fast asleep next to her, and downs a glass of water. The water spills from her small mouth and trickles down her throat to her breasts, as if to cool her heated body, clearly highlighting the voluptuous lines of her body clad only in a slip. In a daze, Shiori indulges in masturbation to get through this long, painful night. Then her son Yosuke appears, having woken up to go to the bathroom...