Isekai One Turn Kill Neesan: Ane Douhan no Isekai Seikatsu Hajimemashita EP12 - Big Sister Forever

After a heavy rain, the city is victim of what appears to be a flood. A closer examination will quickly prove to Asahi that this is not the case: the entire lower part of the city has been attacked by a giant slime, and moreover, it did not come on its own initiative...