Adult video store clerk, Issa, feels like a total loser after losing his job and being dumped by his girlfriend. He is blessed by a stroke of luck when his invention, a curry package squeezing tool, suddenly gains immense popularity. Not only does his invention attract buyers and money, it even attracts unwanted attention from the Yakuza.

Things have never been the same for the local Yakuza ever since Issa Mido invented the famous curry-squeezing device Shiboru-kun. Despite his invention being a big hit, he seems to have completely dropped off the map. The smaller families see Issa as an important tool in order to overthrow the head of the gang, and begin searching for him far and wide.