My sister, who moved into my apartment after saying she wanted to come to Tokyo, is a total indoor recluse, a NEET who's also socially awkward. Her only perk is her incredibly developed breasts, which she flaunts carelessly. Because she's always lounging around in revealing clothes, I can't help but notice her... I got caught masturbating to her, and to my surprise, she turned the tables and seduced me, causing my libido to explode! "If my brother doesn't teach me about sex, I might get caught by some random guy and get pregnant..."