Attack on titan's out in BD only in Japan, but japanese BDs ain't cheap AT ALL.
A simple and somewhat acceptable solution is to buy a Crunchyroll subscription and then rip CR's 1080p stream, which looks good enough most of the time (and is good enough in this specific case).
Alternatively you could wait for the western home video release, which is sure to come since the show did well, and just buy the American BDs when they are released (which come at much more reasonable price tags).
It's not this case, but just for the record, for logo removal needs, on tv-only sources (such as some specials which never were released in home video formats; computer revolution
come to mind), the best solution is to use eraselogo
(guide in french
): first you need to make an lgd in aviutl, then use that lgd in avisynth with the eraselogo filter. To clean up the leftovers, you could use logonr
. Then again this all needs that you have at least a basic understanding of avisynth; if you don't you should try to Read ErMaC & AbsoluteDestiny's Friendly AMV Guides Lovingly Overhauled Largely by Zarxrax