A young girl travels into a magical land to save her brother from real-world bullies...and from the evil King in Yellow.

When her brother Hiroki disappears after a violent altercation with school bullies, Yuriko finds a magical book in his room. The book leads her to another world where she learns that Hiroki has been possessed by the evil King in Yellow, and that only she can save him...and solve the riddle of why the King is also called "Hero."