Gintama filk: Into the Whirlwind, For Our Teacher (Genjô Destruction)

I posted this to AO3 recently but forgot to post it here as well. A Gintama filk about Gintoki, Katsura and Takasugi from their childhood to Rakuyo arc/early Silver Soul arc, focusing on their identity as students of Shôyô. Vague spoilers.

The tune is the song "Genjô Destruction" from the second animated Gintama movie, but the lyrics have nothing to do with the plot of the movie.

( How I wish I had the skills to make AMVs )