Pursuing the truth always comes at a cost... Yuushi has secretly joined a religious organization called the Smiling Hearts Society in search of his missing wife. However, the reality he discovers goes far beyond what he had imagined as he finds himself amongst lunatics whose smiles seem to only bring about death... What really happened in his past that caused Yuushi to lose his own smile? And what is the real motive of his newfound accomplice who appears amidst an unbelievable situation? Determined to find answers, Yuushi crosses the point of no return and begins working to expose the darkness lying within the cult.