Hey Everyone... I Stuck On Marin's Challenge, How to Overcome this?, I have repeated ( the challenge) many times and also brought Rinny to the Manor, and it keeps happening.
if you're asking about how to beat her, you bring Rinny then send her away when prompted, you then meet her instead of Pixie while doing the challenge and you can beat it, then have Marin do the challenge (normal or futa), she looses no matter what and it is currently repeatable (you have to beat the challenge again, then she loses again and so on)
if you're asking how to beat the second challenge forever and move on to the next challenge - there is no next challenge (at least so far), and the second one is just repeatable. it doesn't grey out in the logbook because of a bug, but it is finished for the time being
no, the task in the logbook won't appear completed because of a bug, but if it weren't for that bug it would technically be complete after beating task two, since there are no further tasks for now. so if you beat the second task, that's it for now even though it's not greyed out
edit: after the update, the logbook entry greys out now after you complete the second challenge!