Letter From Thorny Gintama : Season 5 Episode 46

The Shinsengumi attempt to save Tetsunosuke from the Check It Out gang, but the Mimawarigumi stands in the way. Neither side is willing to back down, but Gintoki, who had infiltrated the gang as a Mimawarigumi spy, manages to save Tetsunosuke! Kondo orders the Shinsengumi to begin fighting back!