If I remember correctly, you have to progress with the wolf girl, don't remember the name off the top of my head.
I can't increase my progress with Karin because I don't know where to interact with her, I already did a shower scene with her, but I don't have enough relationship, and I have no idea how to increase it
I think at this point you go to the magic shop and buy bait.
I bought bait, and nothing, I have 3 of them in total
