This arc, and possibly the series, end at ch 26..and this will cover all the way there.
You've been warned...
The earliest public RAW on the site is 21 so there's a few chapters gap, but can be expected that the bitch plan keep failing since Letty is still in that mansion.
But it start with the prince doing a witch hunt on Letty + currently Claude is missing.
Suzanne and Christoph proceed to fight the soldiers to buy time while Letty sneak out with the help of Simon.
After some preparation including the reveal that the old man in the wood is the heroine's grandpa and the head of the merchant family.
Letty then go deal with the prince in a...'duel', where she release the Life Eater on him then heal him to prove her point that she's not doing some witchcraft trickery.
Then she ask the prince to cooperate with her.
Stuffs happen and basically she call for a council of the king + the 7 merchants and basically announce she is starting her own firm and would like to replace the heroine's as one of the 7.
What she offer is 'curing just about every illness'
Bitch tried to argue about stuffs, but Letty has planned everything, including the reveal of one of her case: The grandpa.
(also by now we get a flashback that yes this bitch is another reincarnated person who has done other shady shit for her 'happy ending', her obsession with that mansion seem to be that it's the setting of the game so clearly to follow the plot she need that mansion...)
Then the other 6 families also show approval, saying that Letty have healed someone important to them (wife, mother, child, etc) so they can affirm the result.
Bitch call out Claude as her new partner.
Letty goes "wtf Claude?" at which point he start to react weirdly.
Letty proceed to 'heal' him, pushing out a black magic stone, which turns out to be an illegal item.
Claude who recovered reveal the bitch has been dabbling in various illegal stuffs, and he got that stone shoved in him while investigating her.
Bitch get arrested, Claude collapse.
After he woke up Letty confessed to him, happy ending.
Not, bitch heroine re-appear to kidnap them.
Bitch finally reveal she is the heroine clearly she must get her happy ending.
Letty snap and told her fuck no, your unhappiness is your own fault, what kind of person would find happiness when they blame others for their own failure and hurt others to get the things they want.
Bitch try to stab Letty.
Claude block it and finally pull out the Chekov crest. Basically while the royal family members can't use magic, they still build up magic in this crest, and in fact can release it as a once in a lifetime attack.
He deleted the thot and fall into coma as a result.
After that some time pass and of course he eventually wake up, happy end for real this time.