> Captivating storyline/plot.
> Engaging characters! Torasuke in particular was great!
> Good animation quality.
> Very funny. A lot of dry humour.
> The science in it isn't bad. I am studying maths and comp-sci, a lot of things they mentioned (eg polynomial time reductions, TSP, Tabu search, etc.), even things that are mentioned just in passing, aren't just random sciency-sounding