This stage will only spawn Black enemies. The Boss is Le'Noir, flanked by two Shadow Boxer K's. Doge Dark and Gory Black appear as peons.
For the peons, using AoE cats such as Paris Cat will take care of them. For the boss you must use cats that have a longer range than 410 (Bahamut Cat, Ururun Wolf) so that the Le'Noir doesn't hit them. Protect them well.
Cat Line Up: Dark Lazer.
Seriously, Dark Lazer can solo the entire level. Just spam her and you basically win.
If you don't have Dark Lazer, you can use some of the many anti-black ubers. Some of the most notable are Vars, Oda Nobunaga, Sanada Yukimura, and Maeda Keiji. Vars: Vars has longer range than Le'noir (445 vs 410), and he has a chance to knock back and slow black enemies. This can help prevent the Le'noir from advancing. Vars also has a quick attack rate, so with enough luck and meatshields, the Le'noir will barely be able to hit Vars. Oda Nobunaga: Oda Nobunaga has a quick attack rate, and a 100% chance to freeze black enemies for 180f. His attack speed is less than 180f, so as long as you can hit the Le'noir with Nobunaga, then you can pretty much win the level, as the Le'noir gets knocked back once. Maeda Keiji: Has high health, and takes 1/4 damage from black enemies. Not too much damage and range, but is a useful tank against Le'noir, protecting longer-ranged cats like Bahamut.