Out of Despair is the sixth stage in Sub-chapter 27, Body and Soul.
At beginning you face a Capy. Then three Capies join and five more will be added after a while.
It's quite an easy stage. All you need is 3 meatshields, and the Crazed Whale Cat and the Island Cat (double Whale). Build up your Whales to overthrow the Capies, while making sure they are protected with meatshields. A better alternative for Whale is Sword Master Cat, which is cheaper, does higher damage, and has less cooldown.
An alternate strategy is required 5 to 6 $75-class Meatshield (Cat, Boogie Cat, Pumpcat, etc), Crazed Gross, and Cat CPU (power up). Rich Cat (power up) can help, but not necessary. First, turn off your Cat CPU. Then upgrade your wallet to max, while you stall any approaching Capy. Once your wallet is maxed out, turn on Cat CPU and enjoy the view.