I'm not here anymore is the last stage in Ghostly Houseguests.
Similar to other stages within this event, the last stage is easy enough if you have meat-shields/cannon fodder and area attackers.
Here is a Uber Rare, Super Rare and true-form friendly cat lineup: 4 meatshields, Paris Cat, Whale Cat, Dragon Cat, Mythical Titan Cat, True Valkyrie Cat, Crazed Bahamut Cat.
Using anti-red cats is not a necessity, but can be very helpful if your cats aren't high enough levels, anti-red will also be helpful in the 2, 3 and 4 star levels.
For anti-red cats, try using Brave Cat, Whale Cat, Devil Cat, Bondage CatNEO, Executioner, Brah Cats, Ninja Frog Cat, Knight Cat, PPAP, Thor Cat, Grudge Cat etc.. (Go to equip or cat guide and filter out your red cats to find all anti-red). Red stopper cats can help stop Shy Boy from attacking your meat-shields.
You can also use anti-floating on this level if they are high enough levels to trump your other cats, but they aren't needed as Crazed Bahamut and the rest of area attackers kills The Face and Shy Boy with ease.