I redid some of the old levels and encountered what might be a bug on the second stage that only seems to be happen if you reuse an old save file : no matter how many times I attack or jump over the catgirls in the level 0-2, the beads refuse to get triggered, making me unable to get the ending that need them.
Maybe it's a bad interaction with the new "permanent corruption" thing?
I didn't have this problem when I redid the level on a new save file though so i'm not sure.
May you show me what is the blue tar look likes ?
Go to the map where you can choose the levels to go to (route A11) and if you go towards the south east, you'll eventually (it's fairly quick) see a sort of tower. Go there and you'll be on the map with a werewolf, multiple tiger girls and the blue tar.
Be ready because it's pretty much a duel with the werewolf, and because the blue tar doesn't seem to do anything once the werewolf is dead.