Touka Mimori barely registers with his classmates, so when their whole class is summoned to a fantasy world and handed combat skills, nobody is surprised that he is ranked E for a supposedly useless status-ailment power. The goddess Vicius tells him the lowest-ranked heroes get quietly disposed of, then dumps him in ancient ruins to die. His 'worthless' skill turns out to land almost every time, letting him poison and paralyze anything in his way, and he aims that power squarely at the goddess who threw him out.