Ayumi is your tipical teenage girl, she likes singing, drawing, hanging out with friends, etc...altough, there's a small secret that no one knows apart from her...since she saw her auntie get pregnant with twins, she's always been obsessed with pregnancy, alwayis searching ways to feel her body change like her auntie. One day, as she was surfing on internet as usual, a link to a video caught her attention: "my experience with Tum Inc. How my bofy changed from a petite girl to a heavy pregnant woman". Curious, she clicked the video, where a heavily pregnant woman welcomed her and started explaining her path, showing a photo of her before her experience, she indeed was a petite girl with no curves at all; a complete different from the one she is today