
It's her female friend. She's "in love" with Jin (she's also one of the three girls who once confessed to Jean and took it back, saying she was just joking). On the night she died and isekaied, she want to confess again. So when the goddess asked what she want, she said she want Jin, and the goddess give her the doll which was made based on her and Haruka's memories.
But she use 'Jin' more like a living sex doll. She could lock herself with 'Jin' in her room for days, doing that. She's kinda delusional and that's disturbing. Ah, also thet still using 'Jin' as errand boy though... like for stealing spirit sword from gold rank adventures.

Yeah, the heroes is all awful. The male one is that girl elder brother and Haruka's (Jean's sis) boyfriend. At first, I thought he's kinda okay, but no.
He want complete swordsmanship, but for that he need to basic train, and he didn't want to go through hardship at all, so he also had another skill to skip that. And then, he was jealous of a sword master who had a magic sword, so he beat the sword master and steal his sword (this wasn't explicitly said in novel, but I think he also mocked the swordsman, saying he was weak or something and making the swordsman obsessed with strength).
The girl also want a magic sword for "Jin" and Haruka maybe also want a magic bow, so they sent "Jin" to take it from the gold parties adventure (and creating disaster in the process).
They're very egoist and only care about themselves.
!!!!!!!!! Oh shit does this mean the sister actually cares? Or maybe not… ┑( ̄Д  ̄)┍