Well I'm disappointed, is this the dreaded Gal Cleaning that had so many shaking in fear and anger?
The way I heard about this manga, it was supposed to be extremely offensive, truly revolting trash. Like pulling the rug underneath the MC and having the heroine NTR him or something.
In the end, I got a gigantic whiplash by way of an unnecessarily dark flashback focused on a unnecessary love rival that was introduced just a chapter prior.
Unnecessary is the key word here, all of that mess has zero impact on the actual story and vanishes as quickly as it appeared.