Cloudman said:
Okay, that was pretty good and cute, especially seeing all the witches with their hats xD But they show a lot of spoilery things in the opening!! D: Why do they do that..?! |
If you haven't read the manga then you'll have no context for what you're watching until it happens. In that regard, the only thing it spoils is that some cute girls are going to appear. The title itself tells us that there are seven witches.
Of course, many of those in Japan who watched the anime already knew the story from the manga. I've seen anime openings which have characters who won't even appear in the anime. They're less concerned with anime spoilers than we are. Pre-release trailers will often show a lot of key moments.
