I remember visiting this website once...
It was called Gintama 636 - Read Gintama Chapter 636 - Page 1
Here's some stuff I remembered seeing:
Tips: Direction to read Gintama 636, please read Gintama 636 from right to left. You can use left and right keyboard keys or click on the Gintama 636 picture to read Gintama 636 next page.
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