Summer Vacation, Kitty, and Aji

Tsumugi has decided that she's a cat! When Kouhei gets an ice chest full of yummy fish, she's more than excited to watch him make them! But to make namerou, or as Kotori calls it, "fish hamburg steak" you have to be able to filet the fish, and Kouhei doesn't know how! To make matters worse, neither does anyone else! Can he turn to the internet for help?