As Lightning continues to investigate the Blue Night, he notices the names of three people. After the Blue Night, three men left the Knights of the True Cross Japan Branch and became priests living at the Southern Cross Monastery, the place where the Okumura Brothers grew up. Lightning and Suguro visit the Monastery to get a firsthand account of what happened back then. Lightning, willing to take strong measures against those who remain silent, closes in on the mystery of the Blue Night...

Yukio wants to know the secret of their birth while Rin believes there is no need to know. As their ideas clash, Rin and the others head to Kyoto to attend the wedding of Juzo Shima and Mamushi Hojo.