Who Says Knights Can't Backstab?

Synopsis: A former top rogue, reborn as a knight, arrives in the early years of the disaster. Beneath the prosperous appearance of La Rochelle, countless undercurrents are hidden. The border is invaded by undead, powerful neighboring countries are surrounded, and the kingdom's internal troubles continue... The mountains and rivers are broken and the wind blows like a feather, in this chaotic world, at the end of the prosperous era, the young knight Cyril, along with the future undead queen, with a towering aura, pulls out his knight's sword from the back of a lich: "Hey, eat my righteous backstab!"