Is the "sisters" tag right? They don't share a surname...

Technically this isn't Sakura and Rin either, it's those two sisters from the third war.

They're sisters though

Yes, Rin's dad gave Sakura as a child to the Matou family, because the Matou family didn't have a mage of their own. Sakura's purple eyes and hair are a side-effect of magical worms in her body.

I'm removing those tags, because the general policy on Danbooru is to not tag something that would likely be a spoiler. Rin and Sakura pretty much is a spoiler, albeit a minor one.

Better clip some of these posts too.

Given how many *other* posts there are with them tagged as sisters, it seems a bit pointless not to tag this one.

I've edited it back.