On the border of Saint-Marco and the Loire of the Blue Griffin, a new city is being built, which should become a connecting link between the recently warring kingdoms. However, disturbing news comes from there. Accidents happen all the time in construction, and as time goes on, these incidents become more and more sinister. Mark de Segur understands that someone is trying to interfere with the construction of the new royal city, and together with his friend the nine-tailed fox Lee Jin Ho and his faithful squire Charles, he heads to Lourdes to conduct a secret investigation there. On the spot, he unexpectedly meets the Black Lord, after which events take an even more strange and dangerous turn.