Kana-chan, a niece who hates studying, is left in the dilapidated house of her uncle—a jobless, NEET, 48-year-old virgin, and utterly perverted man—for seven days while her parents are away on a trip. Locked in a dimly lit, decaying room, she's subjected to endless whispering of the "7 times table" in her ear every day, and forced to watch... At first, Kana-chan struggles, crying out "Gross! Stop it!", but gradually her eyes become vacant... "Everything Uncle says...is right..." Her brain begins to melt, and she resists...