Natsu wakes up in Sakura's body. It only gets worse from there.

Koyuki Dragoon is an Ice and Water Dragon Slayer and a mage of Fairy tail. Her dragon parents disappeared the same year as every dragon, year 777. After being discovered and adopted by the Fire Dragon Slayer, Natsu Dragneel, her whole life changed. Years later, after living with her polar opposite brother figure, things seemed well for the young mage, until one mission. The two went on said mission with their team to investigate an active ruins that's being used for the Dark guilds use. Things take a turn for the worse for team Natsu, a dimension was opened and the Ice-Water Dragon Slayer mage was absorbed and taken far away from home and placed in a world where magic is not the norm, but abilities called Quirks. "...We're not in Earthland anymore..."