help me

Hey!^^ I'm looking for a manga but I can't seem to remember its name, I think its genre was either shoujo or fantasy. It's about a girl that gets transferred to another world and has the ability to go back to her own world, to hang out, take baths, or to get weapons from her brother ( which was also a lolicon that served the army(?) ) I'm not sure if this is a part of the story or not, but I also think that I remember her going to other worlds as well and learning how to wield guns and other weapons
Thanks! <3