It's hard to give a straightforward yes or no. Comic Concepts has its pros and cons. Some of their products are great, but there have been issues with delivery and customer support in some cases.
It depends on a few factors. If the animation follows the original story closely, uses good quality graphics, and has a coherent plot, it could be considered legit. But if it strays too far or has poor production values, it might not be.
Well, the legitimacy of G Mart Comics is a bit of a mixed bag. Some customers swear by it, but others have run into various troubles when dealing with them.
Honestly, I don't know. You could look into its reputation in the manga community, or maybe see if there are any reports of scams or issues associated with it to determine if it's a trustworthy store.
Using bleacher can remove the writing, but it may damage the paper. In addition, you can also try to use erasing magic, alcohol, toothpaste, and other methods to remove the handwriting. However, it was important to note that different methods were suitable for different types of handwriting and paper. It was best to experiment on other papers first to ensure that the original paper would not be damaged.