The opening video for the upcoming eroge Mecha-con!, onomatope*'s debut title releasing in Japan this April 8. A sudden change in law by the government ten years ago decreed that rich men must have multiple wives and father lots of children. Haruki's parents passed away in a traffic accident and he inherited the family wealth while continuing to manage the Sakurajima business group. Even though he hasn't had a girlfriend before, he now must propose to those girls that are closest to him.