In the chaotic labyrinth city known as “The Gray Neighbor,” lives the proud “Crimson Princess Knight” Alwyn—and her so-called “kept man” Matthew. While Alwyn continues to challenge the dungeon in pursuit of restoring her fallen homeland, Matthew secretly stains his hands in the shadows, doing whatever it takes for her sake. In this city overflowing with desire and corruption, what path will the two of them choose to survive…? The shocking isekai noir saga enters its second act!