Liz goes to a store and buys a vintage tabletop game. Upon returning home and opening the box, she is teleported to a fantasy world where she is greeted by a goddess of muscles; the goddess tasks her with finding the “futanari goddess” and then departs
Liz doesn’t understand what has happened, but suddenly she undergoes a transformation: she grows muscles, her breasts and buttocks enlarge, and her clothes tear.
Upon seeing her body, she tries to find something to wear, but suddenly as she touches herself to cover up she is overcome by a desire for sex, and she spends a long time masturbating
Meanwhile, in real life, her friend emily visits Liz’s house. Upon entering, they find the place empty, save for an old box; when she opens it, she is teleported to where Liz is. She sees her now large and muscular masturbating, until Liz notices her presence
Liz explains what happened, and Emily understands; now, both of them must find the futanari goddess and escape the place
Both will face various challenges and make great strides before encountering the Futanari goddess; upon finding her, they decide to stay in the fantasy world for a few more days after their long journey
After a grand adventure, both are teleported to the real world, unaware that a new adventure has just begun for Liz and Emily in their new bodies
