Ah! My Girlfriend is a Demon Summoned from the Depths of Hell!

An abnormal high school student suffering from an incurable case of chuunibyou (Eighth Grade Syndrome) fancies himself an all-powerful demon lord reincarnate! But when, beyond all logic and reason, he successfully manages to summon a living, breathing demon of Hell, his life is turned upside down! What crazy hijinks will ensue when his house is filled to the brim with hellspawn!?