r-15
A light novel series by Fushimi Hiroyuki, with illustrations by Fujima Takuya, adapted into a 2011 anime by AIC.
Characters
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Note
On NicoNicoSeiga, posts that are considered NSFW are tagged as R-15, with no relation to the copyright whatsoever; to a lesser extent, some NSFW posts on Pixiv are also tagged as R-15. As both sites use the tag differently to how the tag is used on Danbooru, do not use this tag unless the image actually depicts the copyright.