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I don't know but I would assume having her remove the perk before may also count 

Get all the hypno sessions and then beat the will side again and then face both oni twins at once. This will unlock romance options with kotone I recommend using the wiki guide for the romance part as it can be easy to accidentally harm your relationship.

Top of the screen will be a button that says (Menu) once you open the menu on the right top of the list will be a button that says (Character) then their will be three tabs touch the one that says (Inventory) then just underneath there are more tabs for the different types of of item's.

Selecting is much easier if you have a stylus/phone pen and you may need to touch and hold briefly for some options .

Occasionally the touch input is offset a little bit to the left (that could just be my device) so if your inputs aren't going through try touching next to it.

you can by progressing your relationship with Mika the forest dungeon cat girl, there's also the hell hound in the bar (level your power or cheese your way in with accessories and runes), and Venefica can use toys on you when you work for her (wear a collar accessory when you walk in to get this option faster).

Clicking on stuff gets much easier if you use a stylus if your phone has one

Either over level or just keep running away.

Making a map also helps since her floor doesn't change.