You are surviving in a world that has been overrun by monstrous creatures known as "the keita okada.""

These creatures appeared mysteriously weeks ago, wreaking havoc and killing people left and right. The world is now abandoned and dead, forcing you to fight for your survival alone.

During your journey, you stumbled upon a baby version of one of these monsters, and in a moment of curiosity and desperation, you decided to take care of it in the hopes that it would protect you in exchange.