Top 2 in Top 14 best gothic style anime you should watch once.
Gothic style anime theme music, Ergo Proxy
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Link to view: http://animevietsub.tv/phim/ergo-proxy-i1-a854/
If one character is enough to make a gothic-style anime, then Re-L is really enough for Ergo Proxy. As an investigator with the Rondo Intelligence Bureau, Re-L is caught up in a string of puzzling incidents. Instead of detracting from the fun, the guesses involved in these confounding mysteries keep viewers hooked.Like Sword Art Online, the plot is one of Ergo Proxy's strongest points, but without the standard of gothic excellence that is Re-L, the anime wouldn't be. Her personality is nuanced, thought-provoking, from her makeup to her manners, Re-L is the perfection of Ergo Proxy.