Gintama° - episode 20 - 18 Aug, 2015

Overall episode #285 The dirty hero who protects the Earth from the shadows of the kitchen shows up? On the night of the summer festival, when everyone's in high spirits, Hijikata and Okita are making their rounds when they run into a man brandishing his sword at couples, who ends up being Kondo. He seems to have gone mad after his beloved Otae turned down his invitation to spend the festival together. Unable to bear the sorry sight, Hijikata and Okita give him a Roachief RX mask and run away. (Source: Crunchyroll)