After heading south to investigate the place known as Tomato Heaven, Maru and Kiruko head back to Tokyo via a "ferry".
And maybe the walls are there to keep them all inside!.
Maybe those who are inside the walls are not in heaven.
Maybe life is not what it seems at all.
Meanwhile in the school, Tokio, with the help of his classmate Kuku, uncovers a frightening secret.
This specific beast is amphibious, making him extremely deadly as he can easily take cover in the sea.
But they are ambushed at sea by one of the man-eating Hiruko monsters.
After heading south to investigate the place known as Tomato Heaven, Maru and Kiruko head back to Tokyo via a "ferry"