maiibuniii

Louise is a magician at the Tristein Academy, dubbed with the nickname "Zero Louise" due to her inability to effectively use her magic properly, resulting in zero successes. An upcoming test at her academy requires her to summon a familiar, a servant and partner to support her as a magician.

The story revolves around Rin Okumura, a teenager possessing abnormal strength and endurance who, along with his younger twin brother Yukio, was raised by Father Shiro Fujimoto. Soon after Yukio departs to study at the prestigious True Cross Academy, Rin learns that he is the son of Satan, the strongest of all demons.

Raku Ichijou is an average high school student. He also happens to be the sole heir to the head of a Yakuza Family called the Shuei-gumi.

One morning, as office worker Kobayashi gets ready for another day at work, she is greeted by a terrifying sight—the head of a large dragon staring into her eyes from across the balcony. The dragon immediately transforms into a cute, busty and energetic young girl in a maid outfit, who introduces herself as Tohru.