Wealthy, handsome, and successful, Arthur Louis Zetes is no stranger to the greed of people. Constantly doubting those around him, he has no faith in humanity; thus, he makes a request for the perfect maid—a robot maid. However, his butler is unable to acquire such a servant due to technological limitations, so he finds the next best substitute. Marie Evans is a former child prodigy in martial arts known for her lack of expression. Drowning in debt, she readily accepts the offer to be a maid that acts like a robot. While Arthur is often blunt towards humans, he cannot help but dote on his personal robot; in turn, Marie is moved by his drive and consideration toward her.

When high schooler Mari bumps into a fellow tardy student, she's surprised to find out he's a beastfolk who's to attend her school! After all, it's not rare for beastfolk to coexist alongside humans, but it's still uncommon, with the prejudice and all. Nervous to meet one at first, Mari soon learns there's more to him than his furry exterior. In fact, the more she gets to know him, the more she finds herself drawn to him, his steadfastness, his kindheartedness, and... his body...

Sae Iwata was never cute or dainty like the other girls, and due to her build and strength, she always felt the need to look after her delicate childhood friend and crush, Kouki Kamishiro. But as years passed, Kouki grew taller and more confident, which resulted in them drifting apart. Toward the end of middle school, Sae reconnects with Kouki. Seeing that Kouki is still the sweet boy she once knew, she realizes that her dormant feelings for him have resurfaced. She tries her best to suppress her emotions—but it becomes even more difficult as, come high school, they end up in the same class. Ignoring her deepening feelings may seem like a fool's errand, but this boy that shines brighter than the sun may just prove to be her destiny.

As a vampire, Luna Ishikawa can be considered a unique transfer student. With her cool demeanor, she has quickly become her class' center of attention. Normally, it would be nearly impossible for Tatsuta Ootori—a completely average guy—to ever interact with her. However, this changes when the two are unexpectedly paired together for cleaning duty! After Tatsuta spontaneously forms a friendship with Luna, his impression of her slowly crumbles: she is not the mysterious and collected girl everyone thinks she is. In fact, she is unable to even suck blood properly! Resolved to help Luna overcome her ineptness, Tatsuta proposes to become her practice partner. Pumping life into their mundane school days, the duo gradually works toward their delectable goal, improving Luna's blood-sucking skills with every bite she takes.