This is the first stage in chapter 1 of Annihilation City's collaboration event stages.
Warning: This Strategy Is Not Tested!
Start By Sending Out Tank Cat To Build Up Money, Replacing each One, Once You Have About 3000~6000 Cash, Send out Dragon Cast As it should Deal With Doge, Those Guys, And Snache. Once Yakuya Comes Out Your Stack Of Dragon Cat Should Kill Yakuya as He has only 1000 Hp and 60 Dmg. If You don't have Dragon cat Stacked Yet Then Build up money to send Out Bahamut. He should Kill Yakuya Easily! After That you Have Basically Won!