Strike The Blood Vol. 9 (Light Novel)

Kojo Akatsuki is, at first glance, an ordinary high school student at Saikai Private Academy on Itogami Island, a man-made island south of Japan that is a sanctuary for monsters and demons. However, there’s something different about Kojo: he is suspected of being a powerful vampire known as the Fourth Primogenitor who has the potential to disrupt the balance of power in the world!
Yukina Himeragi is an apprentice Sword Shamen from the Lion King Agency who is sent to observe Kojo and eliminate him should he prove to be a threat. Taking her role as observer very seriously (perhaps too much so), she moves into the apartment next to him and begins following him everywhere. However, she soon realizes there is more to the situation than she first thought, and unbeknownst to her, there are threads of fate that bind them together as she eventually begins to develop feelings for him in this supernatural action light novel by Gakuto Mikumo and Manyako.
The Black Sword ShamanKojo and the others are roped into going to a newly constructed man-made island resort called Blue Elysium, where Kojo finds himself stuck in a part-time job. Meanwhile, a Shamanic War Dancer of the Lion King Agency named Sayaka Kirasaka also comes to the island on a mission to rescue a mysterious girl named Yume, but she is assailed by an unknown Sword Shaman who uses the same techniques as Yukina!
Notice: This light novel is written in Japanese.