Daichi and Waka, who had just started dating, went trekking to enjoy the autumn leaves. The two, who had been in a pure relationship, kissed for the first time that day, deepening their relationship. However, on the way back, they got lost and ended up wandering through the mountains... They ended up at a mountain lodge inhabited by monsters. The monsters, who had their eye on Waka's beauty and voluptuous body, tormented her right in front of Daichi's eyes. After days and nights of creampie sex, before long, a child, whose seed it was unknown who it was, was in Waka's belly...