
So after not seeing the master (and demon king) for 13+ months, she decides that she's in love with the master?? After asking her 'flirting demon friend' to kidnap the girl that's spending time with the master??
That's called an obsession, coupled with jealousy, degenerating into violence.
She's gonna kill later

new girl Stephanie, red flag #1: was looking to see if there are any PROPERTIES to buy for a villa (without any transportation),
#2 I'm part of the rich merchant ppl but I didn't come with anyone/thing
#3 parents will arrive in few days away after sending a letter, but I came here from that far away without scratches / provisions
- that's all from her mouth in 10 mins

Good looking men, but sponge-like female lead.
She really is like a Mary-Sue character where everyone coddles her, loves her, does things to her, but she doesn't have any viable characteristic besides blush and accept actions done to her.
Reminds me of those "Turned into Villainess stories" where you see the 'heroine' be the dimwitted lovey-dovey with the fiances, and you wonder "the fiance went for that shit-brain?" - this girl reminds me of those 'heroines'.
Points were deducted when Mari couldn't eat on her own...and kept going
couldn't finish ch5 after the rushed love confession.
You would think someone with authority would strip her "savior" status she refuses to learn magic to help the country her status is for. As in, gov't work visa status. .
If the prince wants to fraternize with her, he can when she's stripped of the status and castle influence, demote her to commoner.