Synopsis

At Sainan High School, it's rare for a day to pass without the conversation turning to breasts. Today is no exception, and Lala - ever eager to win Rito's affections - is inspired to invent a device which will allow her to change the size of her chest to match his preference. However, the device goes horribly wrong and ends up turning the hapless Rito into a woman! Ogled and pursued by men, cared for and tolerated by women, Rito soon discovers the ups - and downs - of life as a girl.