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.
I'm not sure specifically as I haven't read it. It could be about a girl who is involved in giveaways, perhaps in a fictional world. Maybe she uses giveaways as a way to interact with others, or it could be part of a larger story about her life and adventures.