Valhalla Penis Mansion summary: Shota Iijima picked up erotic books during his childhood and suffers from a severe foreign sister fetish. Thereafter, from the years between his age of 12 to 15, he masturbated 999 times. For his 1000th round of masturbation, he had been transferred to a different world. And Shota is sold as a slave. A paradise for women and hell for men… Valhalla, the penis mansion.