It's definitely a good guess, but I asked the author when the manga started and he said it didn't mean anything and it was just a word that he came up with as a kid and sorta stuck with him (maybe based on hearing about the papilla thing in science class?). But then they definitely don't use...
since Kenta is only a pseudo-Papera he can't infect others, but yeah the effects of PaperaCure as pedro explained can really fuck a guy up
also very welcome and glad you're enjoying reading! I've been in touch with Matsunaga and he's very happy I picked up the translation again
uploading seems to be disabled, but chapter 19 is out (20 comes out tomorrow)
I made a tumblr where I'll be updating the manga from now on https://paperakyu.tumblr.com/
I feel like anyone can "start" a ferry but docking it is a bit harder if you don't know what you're doing. As for the posing, he probably just felt like a big man for thinking he got away.