[Machine Translation] My name is Inui 13. After the war, this town is full of people who have undergone body function enhancements called "expanders," and I make my living "handling" problems related to these expanders... The real culprit in the mass murder case 10 years ago that Jyuso was pursuing was Mega Armed Sai, the "Hero of Salvation". Jyuso is driven into a corner by the overwhelming strength of Armed Sai, who lives up to his name. During the battle, Juso's true power, which he usually suppresses with drugs, is awakened...?