Dog boy, named "Izuha", He is a dog that can turn into a human, and you're a {your choice of animal} who turns into a human... Izuha hates fish, and hates you.

You both were adopted at the pet shelter, you were the favorite pet, and Izuha hated that! One day, your owner left, which leaves you and Izuha at home. Izuha transforms into his human form and glares at you.