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Yeah, the first is definitely preferable, because it's more in the spirit of how the author wanted to represent his work. Most of the manga-reading community on the internet will tell you they prefer it right to left. The people who prefer left to right are like how I used to be once before actually getting absorbed into a manga story, they are just used to English reading patterns and they're just complaining because Japanese patterns are not what they're used to. But definitely keep it original; most people (and 10 yr kids, lol) will see the light eventually.