whats the password for the shady guy? and where do I get clothes for other climates?
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It's a Master or greater tier reward on Patreon to unlock the whole gallery. There are no limited scenes so you can get them all by playing.
As for the climate zones, you don't need new clothes but rather master elements with Ayane's help. Just follow the main plot to do so. If stuck, check out the help function in the on-map menu.