Walking home from school Aya Iseshima stumbles upon a brutal brawl between two girls fighting over something called the “Platonic Heart”. Being a martial arts master herself Aya interferes in the fight to break it up. Afterwards Aya befriends one of the fighters and finds out the Platonic Heart is a jewel that can grant one wish for any girl that posseses it and there is a battle royal tournament going on for its control. Unfortunately for Aya it seems her interference has now registered her as a participant in the fight and it looks like there’s no way out but to win.

Yuki’s earliest memory is of a stormy night in winter, wherein she was attacked by a vampire… And then rescued by another. Now 10 years later, Yuki Cross, the adopted daughter of the headmaster of Cross Academy, has grown up and become a guardian of the vampire race, protecting her savior, Kaname, from discovery as he leads a group of vampires at the elite boarding school. But also at her side is Zero Kiryu, a childhood friend who’s hatred for the creatures that destroyed everything he held dear, is now determined never to trust them. This coexisting arrangement seems all well and good, but have the vampires truly renounced their murderous ways, or is there a darker truth behind their actions. Is Kaname’s infatuation with Yuki the beginning of a forbidden romance, or is it something in her forgotten past that draws him to her. Because in this world of secrets, nothing is as it seems. And the price of misplaced trust may even be worse than death.

Kuu Shiratori often fantasizes and dreams of her “prince”, and longs to meet him as her ordinary school life in the school-city of Academia proceeds. One day, a young man, Kyoshiro Ayanokoji, transfers to her class, and strangely enough, bears a striking resemblence to the prince of her dreams. Kuu is elated, but soon after things start to not go her way, as she soon finds out that Kyoshiro is different from how she imagined him to be. However, after Kyoshiro saves her after she gets caught in the middle of a fight involving mechanical creatures and magic she has never witnessed before, she begins to appreciate him once again, and thus, a beautiful relationship between two young people commences.