Well, if some is interested, i'll write what she did in the live action. I already wrote it on one chapter, but who knows on which now lol
Don't know if the manga does it the same way since i only saw the raws up till ch 122. My guess is it will be the same since everything until this point was...
Karin hires a Yakuza type of guy who deals in human trafficking to kidnap Aoi and sell her of as a sex slave.
They actually end up kidnaping her together and hold her captive in a store house. Karin is happy that she won but Aoi taunts her non stop. She wants to hurt her but the Yakuza guy doesn't allow it since he sees Aoi as a premium slave, and any damage to his "goods" would hurt his business. Aoi still continues to taunt till the point that Karin snaps and grabs a knife. The Yakuza tries to protect Aoi but as he rushes to stop Karin she accidentally stabs and kills him.
Karin now in panic start to again play innocent and blames Aoi for this. She runs to stab Aoi, but Kiritani pops up out of nowhere and takes the stab in his belly. The police also arrives at the same time and arrest Karin.
Aoi in shock and not knowing what happened holds on to the stabbed Kiritani, but he tells her everything will be ok. He explains that he planted a GPS in a charm he gave her, that's why he knew what is happening and acted on his own behind her back.
We then get a small time skip and Aoi and the now recovered Kiritani work at the bar together as a couple. The end.