Yuki Cross's earliest memory is of being attacked by a vampire and being saved by Kaname Kuran, also a vampire. Ten years later, Yuki and vampire hunter Zero Kiryu attend Cross Academy as school guardians protecting the "Day Class" of human students from the "Night Class" of vampires.
The first chapter of the Refrain Blue series, tells about the recollection of Yoshihiro's past about various events of summer school, of the fate where encounter and separation are interwoven with each other, as Yoshiro and Matsunaga will pass the Toyo Gakuen and will arrive at summer school at...
The second chapter in the Refrain Blue series focuses on Nao Morisawa and the events that happened at the summer camp last year, with her and Yoshihiro Matsunaga both unable to let go of feelings of the past.
