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In the last chapter of the Refrain Blue series, the bond between Yoshihiro Matsunaga and Nao Morisawa grows stronger, while Yoshihiro finally finds out the identify of the mysterious girl from the first chapter.

It's been years since hero Takeru was at the top of his game. And now, it's time for Takeru's son, Kakeru, to take up the heroic knight's mantle and save the kingdom from a burgeoning evil. Lucifon's minions are on the march, preceded by a mysterious black mist that turns everyone it touches to stone. Led by Eto, Kakeru and his friends must take the fight into the very heart of Lucifon's despotic empire or become statues for his garden.

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 seashore. A mysterious girl smiles as she watches Yoshiro who stands still at the seashore dusk.

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.