Des：Azusa, who is about to take her university entrance exams, attends a summer course, so instead of going on a family trip, she stays home alone. Worried about this, her parents ask her sister, a relative, to stay with them. That night, a heavy lightning strike causes a power outage and darkness descends. The air conditioner wasnt on and the room was stuffy. The two hug each other in fear of being struck by lightning, and gradually become sweaty. Eventually, the smell of sweat drives them crazy...