Gintama
Samurai comedy in an alien-occupied Edo, and one of the longest lists of distinct opening sequences in television.
Gintama opens with a main title sequence of 100 seconds.
At 100 seconds, it opens well above the 58-second median for animation sequences in this catalogue.
It arrived on TV Tokyo in 2006, when Naruto and Yu-Gi-Oh! GX were also on the network.
The opening titles
Season 1
100sCrunchyroll's posting of the first opening, "Pray". The series went on to cycle through more than twenty openings across its run — only the first is verified here.
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