カードキャプターさくら 1

Cute and fun, but not for an absolute beginner

Strictly speaking, the vocab and grammar aren't particularly difficult — on par with any other shoujo or shounen manga — but it has some quirks that make it tricky for language learners. One of the main characters speaks in a strong Osaka dialect, and since he delivers a lot of necessary plot information that's a roadblock. There's a lot of asides handwritten outside the text bubbles, which are difficult to make out if you're only used to reading perfectly regular Japanese computer fonts. The main character occasionally uses somewhat archaic vocab when performing magic (like the pronoun 汝), but it's repeated often and in the exact same way, so you just have to learn it once; otherwise the vocab is very typical day-to-day material, hardly any made-up fantasy jargon at all. And lastly, the characters do use occasional slang or slur their pronunciation for comedic effect (for example ごひほうはま instead of ごちそうさま), which will make some lines baffling and impossible to look up if you're an absolute beginner.

Once you get past all that, though, it's a great series and very enjoyable.