Once you get over 100 Lewd and do the 'Bathroom Cleaning' job three times you can walk in on your own. Might also require doing Park Exhibitionism three times or going into the Men's Bath of the Oasis (through the maintenance entrance in the women's bath).
Yet another thing I had to clue was possible in the game, what scene even is there?Is it possible to enter to WC at Nether Ward?
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