Only just discovered this manga, despite really liking the WN.
I'm quite enjoying it, though there are some character designs I find quite disappointing, particularly the design of the one flash 'master', as I always imagined him as looking more... well less like a wrinkly old man - it feels like he should look like a reliable samurai, to the point he looks stereotypical.
Some other characters, such as the MC, are just so basic; the MC here could be mistaken for the long haired emo looking MC of like a 100 other series, and that's an underestimation.
Anyway, this post is just someone whinging that the adaptation isn't exactly how they imagined it should be - but it's still enjoyable.