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LOL epic name :D
BONES is really experienced on battle scene, and before I have watched an video talking about the drawing in Fullmetal Alchemist, some special texture of line draw using fashion like Chinese writing brush, expressing the tension of fighting atmosphere.
Another strong production company is Madhouse
One Punch Man which is loved by many foreigners is from this company

Indeed. One Punch Man is great.

the craziest part is that the background is a dynamic one.
normally restricted by the budget (jp animation is very budget oriented, i have that much of budget, then i produce that much of quality), the background is static one.
But One Punch Man is not......
That's why people saying those fighting scene at last few episode is BURNING their passion and money lol

I don't doubt it those fight scenes were pretty epic.