Fleeing from his own race, Orgun—an alien being with superhuman abilities and unearthly weapons—travels to Earth to find an answer to his origin. There, he bonds with a young man named Tomoru to defend Earth against the Evoluders, who seek nothing but destruction of other civilizations.

Fuguno Matsuo has never had a girlfriend all his 24 years in life and what makes things worse is that a fortune teller predicted that he never will. However, when he laid his eye on Nagisa-sensei he fell in-love right away and began earnestly wooing her. Along comes Hamaoka, a co-worker who is smitten with Fuguno, and a love-triangle ensues.

In a country where companies are categorized into many subdivisions and corporations, only one of them is a ghost corp—the Phantom quest corp. When otherworldly supernatural phenomenon threatens the city and its populace, Ayaka Kisaragi and her employees are on the job to fight any and all supernatural menace.

Ifrit, who has been trapped in Rimuru due to the latter's Predator skill, recaps events of the season while in a discussion with Veldora as they play Shogi.