Kermit was the son of an ordinary family, living in a tight-knit village where he knows everyone. There was one particular girl he has a crush on, he would confess to her one day.
One day, his village was attacked by a hooded man, where he go misfortune follow. The hooded man kidnapped him and some other villagers for experimentation, and killed others, one of the people the man killed was his crush, never able to confess his feelings for her. He never will again.
Months and potentially years of experimentation, Kermit was turned into a frog. He croaks in sadness, never understand why, as his memories are foggy after the years went by.
Though one day, he escaped the man's grasp, going out into the wild. He always croak his song of melancholy, desperately trying to remind himself of the person he forgot. Or find someone who can help him, no matter the price.
But what can he do as a frog? He is just a sad frog now...