@Jarkko Because even water becomes harder than concrete when hit fast and hard enough due to surface tension, so even if slime-san can meld into any shape it wants it still has surface tension.
I love this manga, Nozomi and Kirishima have such nice chemistry. The part's that I especially love are when Nozomi is confronted with a problem he doesn't spend multiple chapters pussy footing around the issue, he understands what needs to be done and pushes himself to do it. Another part that...