Since it's right next to the Nintendo and Pokémon stores, popping into the Jump Shop is a no-brainer for any manga fan. The place is basically a shrine to all things Shonen Jump - we're talking wall-to-wall merch from series like ONE PIECE and DRAGON BALL. That Luffy statue inside makes for a pretty cool photo op too!
The location in Shibuya PARCO's 6th floor means you can knock out three major geek stops in one go (Nintendo, Pokémon, and Jump). It's like they created an otaku paradise on one floor! While your wallet might not thank you, at least you're getting official merchandise rather than the knockoff stuff you might find elsewhere.