HERBICIDALL tells the story of asocial boy Deimos who suffers from his own head and only wants heaven for him and his friends. Living in the rural area with only his plushies to have tea times with, he moved from the orphanage to the public school nearby. There, he goes on adventures and learn that some people may be animals, some may not.

His adventures are accompanied by his new friend, Solanine, who may or may not be: a shithead. Normalcy is impossible