It depends on which ending you're searching for...
Change in Management: After defeating the Devil, said loser decided it's time to change things up. In an attempt to prevent another defeat, the change in manager was a new face, someone unknown to those outside the casino and whose plan of attack weren't grafted...yet. The outfits aren't just a choice of the individual but are, instead, a power code of the casino. This ending is achieved by talking to Classandra, not fighting, while doing a 'good' route.
Saved Soul: Classandra had just finished treating her wounds before heading out into the Casino again. After finding everyone either people defeated or ran, she snuck out as well. Aware that the boys had her contract, Classandra started making her way through the Inkwells, trying to find somewhere else to be. Stumbling across a small house, she's so tired at this point, she begs the owner for a night. They bend. After this, she goes to get any and all jobs she can, from helping Porkrind keep open an extra emporium to waitressing to opening Cloud 9 (her hotel). Strange to think, this is the first time she's truly had full control of her life. This is achieved by fighting Classandra while doing a 'good' route.
True End: After everyone above her has been defeated, Classandra gathered all those able and willing to leave...and they left. With their previous titels and associations, few people they came across took a second glance at them (All said no). This resulted in all of them settling in a building that was left to rot. Classandra, wanting to offer a place for them to start anew, decided to fix this building into a hotel/apartment complex. However, what no one else knew is that Classandra still had her soul contract (in her pocket). Within a few years, almost all were surprised to find the newest round of debt collecters knocking on their door...almost all. This ending is achieved by doing a 'good' route without approaching Classandra.
Bad End: As much as the Devil and King Dice would start off keeping an eye on the boys, Classandra would be the biggest individual catching them doing something too dangerous (even for the casino). This was the start of her keeping an eye on them, which would later divuldge into full spans of parental care, taking over a portion of Kings/the Devils turn. They boys would eventually start learning and even helping Class as waiters. This ending is achieved via any bad ending (though talking to Classandra helps).