Quick answer — Gintama: Dai Hanseikai: the opening theme is "Gintama - Opening 1 | Pray" and the ending theme is "Gintama - Ending 5 | Shura".
Some of the characters get together and talk about "regrets" they have after 4 years of anime Gintama. Soon they fight over who gets more screen time. Special of the Gintama Harumatsuri live event. Gintama: Dai Hanseikai is an action, comedy, and sci-fi anime produced by Sunrise, first airing in Spring 2010. It ran for 1 episodes and is finished.
Also known as: Gintama Harumatsuri 2010
Gintama: Dai Hanseikai has 1 episodes and is finished.
Gintama: Dai Hanseikai was produced by Sunrise and released in 2010.
Gintama: Dai Hanseikai is classified under Action, Comedy, Sci-Fi.
Gintama: Dai Hanseikai premiered in Spring 2010.
The opening theme of Gintama: Dai Hanseikai is "Gintama - Opening 1 | Pray".
The ending theme of Gintama: Dai Hanseikai is "Gintama - Ending 5 | Shura".
Gintama: Dai Hanseikai is based on a manga.
Character data from AniList.
