This is a story about a tomboyish heroine whose dream is to save the world. After entering a different world, she focuses on upgrading and fighting monsters, without falling in love, just to save her little sister.
There is currently no CP, and the author does not rule out the possibility of having a sudden fit and marrying off the heroine. (If anyone is willing to ask for it) Everything will serve to save the little sister. Everyone is welcome to comment and collect.