Saki yoshida is the main protagonist of the manga metamorphosis, saki is a friendless, lonely girl who looks down upon the popular girls, saying that she'll never be like them but when she starts a new school and changes her looks her life took a turn for the worst.
She can’t help but make bad decisions 
And somehow the whole world just likes to make her suffer, poor girl, she is friendly but every man seems to like taking advantage of her because of her beautiful looks she hopes for real love