Everyone was so distracted by the mushroom that they missed out on some interesting worldbuilding i.e "Saito" means "open" in the new world's language. And Saito's specialty is, among other things, opening locks!
There really should be a NSFW warning on this chapter, I made the mistake of reading this of my phone at work while waiting for something and a coworker saw it and can I say how awkward that is? I would never read such a thing at work I even have filters on gore, ecchi, etc. yet this just slipped right through the filters settings.