Use a app to transform a woman who’s self-conscious about her small breasts into a super-sexy body!! One day, a mysterious app called “Growth Assist”—which allows users to manipulate a person’s body type—is sent to the smartphone of Aikawa, a male student with a fetish for huge breasts. Aikawa secretly began using the app under the pretext of helping Yuna Kasumi—a woman in his class who was self-conscious about her scrawny figure—overcome her insecurities, and decided to use it to enhance her physique.Yuna’s bust and hips grow day by day… However, driven by the desire to “make them even bigger,” Aikawa ends up making Yuna’s body grow to an excessively voluptuous size… An original work specializing in 【Super-sized Breasts! Enlarged Breasts! Enlarged Buttocks!】!! (English product description provided by the creator.)