Tatsuya is a young boy obsessed with toys. While his mother is away, a door-to-door salesman arrives and starts showing him a toy catalog—only to suddenly transform into a predatory man who assaults him. The boy's uncircumcised penis, barely sprouting pubic hair, is forced open as the man thrusts his tongue inside the foreskin. His virgin anus is also invaded with a tongue, making him cry out in pain: "It hurts! Stop it!!" However, the salesman is a pervert who wants the young boy to deflower his own anus. When the man says, "Try putting your little cock into my ass hole," Tatsuya, confused and unaware, penetrates the man's anus and starts thrusting. This causes strange sensations in his penis, leaving him even more bewildered.