YAKUZA DLC was a Event Subplace in Midnight Horrors. It was added in Version 1.55.0.1 (April Fools' 2024 Part 2). It is accessed by going in the orange circles on the event map, Bus Stop.
The entirety of it is based on the Yakuza game series, having you kill people for Yen and having different movesets you can interchangeably use.