The Jealousy quest is currently incorrect, the info says
"Stop Succubus from seducing Mina's fans. [Fire Isle] (0/15)"
She says
"That's another story to be told another time. If you play with me and defeat me 12 times, I promise Mina that I will stop seducing her fans."
I didn't keep track if it ended after 12 or 15, however. Just one is incorrect.