@cannarali You may be in luck. On the last page of this chapter, there's a sentence that the translation team skipped. I'd recommend putting it into a translator.
It didn't explain why Ritsuka kept going with the contract if she regretted it and didn't revert it back to a cleaning contract. She mentions that she regrets the contract and doing it with Kozuka while she was drunk in Chapter Six. The reason for her continuing the contract is that her feelings...