MC's system has her matchmaking Male Leads with terrible women, although she is unaware at first. Something goes wrong with the mission worlds and suddenly the 'Male Lead' has been replaced by a woman. She manages to barely complete her mission by helping the lady become a King Kong Barbie with martial arts before the start of the book.

Unfortunately (?), the next Male Lead (YZ) isn't interested in playing around at all until a mandatory compatibility test comes through and he pushes down the tester. It's implied she slept with the previous MLs as well for these tests, but without feelings on either side.

For some reason this time her and the ML fall mutually in love. The system keeps encouraging her to matchmake the ML but something is just off with the 'FL'. Ultimately the FL kills the ML. Dramatic and unexpected Twist!

ML manages to follow to the next world but with incomplete memories. He even eats his own vinegar when she accidentally calls out his previous name after a wet dream.

Beware there is some ambiguous r*pe from a non-ML guy that was pretty horrific. After 3 days of being saved, FL behaves very lusty. Which no matter what romance, seems strange, more hentai kink, I suppose.