Doku Doku Mori Mori

Once upon a time, there was a happy, cheerful village full of loving, joyous mushrooms deep in the forest. Everything was wonderful, and splendid, and bright—until the day he came. Bringing death and destruction wherever he went, the malignant miasmatic mushroom massacred the entire village for no apparent reason. And that, folks, is how the heroine of our story ended up on a journey to see to his demise...

(Source: Yen Press)