Warui Kanzou is a middle-aged man who is advised to stop exerting himself because of liver damage. Moguro offers Kanzuo an extract from a rare mushroom in Okuhida extract to restore his vitality, but warns him one bottle must last a month. After using it up too soon, Kanzou travels to Okuhida to find more, but after eating the wrong mushrooms, he turns into a mushroom himself.
