The city of freedom, Neo York, is targeted by villains day and night, but it's also home to the strongest hero, Golden Man! But one night, during a rescue operation at a fire at an abandoned factory, Golden Man suddenly disappears. Left in his place, a single amnesiac young man with the Golden Man suit in his hands... Who on Earth is he? A new original hero story by the strongest tag team of Petos of Demi-chans Want To Tell and Kouji Megumi of ACMA:GAME and BLOODY MONDAY!

After rigorously training for three years, the ordinary Saitama has gained immense strength which allows him to take out anyone and anything with just one punch.