Imouto Paradise 2 (Vol. 1): Secret Virgin Break ❤ Keiichi Nanase lives under the same roof as his younger sisters—girls who are growing up and entering the age of budding sexuality. Watching them, Keiichi often finds himself harboring impure thoughts. Then comes summer vacation, and Keiichi’s parents head off on an overseas trip. With their parents away, Ririna assumes her slovenly, perverted older brother will only become more lewd, so she adopts a strict attitude toward him. Yet, despite claiming to hate anything erotic, Ririna secretly masturbates—a secret that Keiichi happens to stumble upon.