After witnessing a rare summer snow with his friends, Kusaka Yuu begins to develop supernatural abilities. Years afterwards, he finds himself the target of powerful beings, and learns that his powers are due to the "ayakashi," parasitic organisms that grant special abilities in exchange for a portion of the host's life force. The conflict turns treacherous as Yuu’s friends’ lives also become threatened, and he learns the truth behind the loss of his dear friend, Izumi. Will Yuu free himself from the ayakashi, or will he succumb to the temptation of power?
After being separated from him for ten years, Shin Kanzato and his brother Jun have moved to Ayanagi City to live with their older brother Ryou; but little do they know that a rash of mysterious murders have recently plagued the city, leaving the victims’ bodies turned inside out. Soon, Shin finds himself being attacked by a man who is able to summon a mysterious and ghostly creature; and more importantly, he realizes that he possesses the same powers. Now, with the discovery of more people like himself, Shin finds himself drawn further and further into the world of those who use "Persona."
Both series are about people with special abilities which are a part of their body. They both use them to fight the bad guys and try to change the world for better. In both the main characters have to pay enormous price for being able to release their inner monsters, what often leads them to the edge of death.
Some years into the future, a strange, unexplainable natural disaster has broken off a piece of the Japanese mainland. Known as the Lost Ground, it is now inhabited by people with Alters -- machine-like extensions of their own will. In order to keep the peace on the Lost Ground, the HOLY organization uses its own Alter capabilists to police the region. In the midst of the chaos is a young man named Kazuma, whose life will soon change forever as he discovers his hidden abilities, and how to wield them.
Both anime have a main character with the ability to transform their arm into a powerful weapon they also have to fight people who have the ability to use these supernatural weapons at will. Through out the story they both fight for what they feel is right whether it be to protect someone or just take down the enemy.
Minato Sahashi was living a normal life; he had just failed his college entrance exam for a second year in a row, and lived a quiet life in a single's apartment. That is, until the busty Musubi fell from the sky on top of him! She is a Sekirei, one of 108 that are destined to fight each other until only one remains; and he or she will ascend to heaven with his or her chosen one known as an Ashikabi. Minato soon finds himself in the embrace of Musubi, becoming her Ashibaki - but his life will only become more complicated. Musubi isn't the last to claim Minato as her Ashibaki, and what's worse, plenty of other Sekirei and opponents stand in his way!