Worth bearing in mind too that the long tail on this subject is very long...
Hundreds (thousands?) of anime shows have been released outside of Japan, many of which have dozens or hundreds of episodes each. So for somebody who really knows the subject matter inside and out, the entire SEO footprint for anime is going to be into the millions of searches a month when you start to think along the lines of show titles, major characters etc.
But again all of this is for nothing if you're not part of that world - anime fans will see straight through you if you set up a site populated by shallow content respun from wikipedia...