So what's your 'arena' series, /anime/? For those unfamiliar, your arena is the one anime (I guess it doesn't even have to be a series; It could be a movie or whatever) that, when discredited or badmouthed, you are the one called upon to defend. You are an expert on this series, and will not tolerate anything short of the highest praise for it. This doesn't necessarily mean it's your favorite, but it is the one that you will always defend. For me, it's Baccano (Obviously).