Ribbit ! I became a frog.
Classical story ? Yes ! But with humor.
Follow a guy reincarnated in a frog, when he's going from a little pond, to conquers WORLDS ! UNIVERSES ! HEAVENS AND EARTH WILL BOW BEFORE HER (the frog) !
... Really, you think it will be like that ? What can she do to do that ? Caw all night until kings and emperors loose sleep and beg for mercy ? No, no, follow her when she try to damn survive outside, for starters !!