History's Strongest Disciple Kenichi.
Found it at Onemanga, and is a great combination of comedy, action and martial arts.
Chapter 383:
They infiltrated American Territory in Okinawa to fight Yami members. To avoid detection from the US agents, the Elder is disguised as "Garyuu X" doing a frontal attack.
for those that don't know about Kenichi. this video of the an anime episode can give you an idea.