Gintama: Season 6, Episode 10

6 - 10: The Sound of a Beam Can Pierce Every Heart

Otae has decided that it's finally time to re-open the dojo to new students. Shortly after deciding this, she and Shinpachi meet with an unexpected acquaintance from the past. His name is Hajime, a former student of the dojo who was missing, assumed dead after being caught in an explosion in the terminal. Now that he has returned, he will help them revive the dojo, however there is something different about him.