Persistent doubt is not easily ignored.

As the newest agent of the secret organization known as Reunification, Rii firmly believes in the Mission laid out in the organization's goals. He works alongside his formerly long-lost sister, who has changed much since her disappearance six years ago, and dreams about bringing the Mission to completion some day soon.

But when Rii stumbles upon the true nature of the organization, he finds himself torn between continuing to serve the Mission and quitting Reunification entirely. The matter is complicated by his loyalty to his sister, who he does not wish to betray, despite his gradually weakening loyalty to the cause.

With his conscience and loyalty battling each other in his mind, Rii finds himself faced with a diffcult dilemma, one that, regardless of his choice, will change his life—and the lives of his family—forever.