Cerulean Heart

Minami Yukio is an ordinary high school student with average grades. However, he’s failing his math! His math teacher, Mr. Yamazaki decides that he needed some extra lessons to aid his grades and invites him to his house after class.

But on that fateful day, Yukio discovers something that will change life as he knows it forever: An ancient leather bound book, hidden in his bookshelf! Yukio, feeling the book calling to him, brings it home to study and discovers that the book will allow him to summon beings from it!

What could this mean? Who are these people? How do they all connect with the book? Is his teacher hiding something? Or maybe… there’s more to what’s going on with Yukio than meets the eye!