I need help finding out about what this manga's name is

So like it was about a reincarnated girl into a game, it was your typical romance reincarnated manga trope, but the person she went for is actually a non-target charcater, and was only used for the games advertisement, I think he was a merchant's son and has very light brown hair?? And if I remember it well she has huge power and the only memoriable power she had was the inventory space????????????? This sounds so crazy id understand if no one can guess