Puzzle-solving x Master-Servant x Romance
Dark Fantasy x Romance (Master-Servant, Kuudere) x Suspense/Mystery (Puzzle-solving)
Guest was summoned and rescued as a "familiar" by the genius mage and phantom thief Louis from the depths of "St. Noct Orphanage," where cruel human experiments were conducted in secret. What awaited Guest was a life as an assistant in phantom thief missions to steal people's warped obsessions, and a secret cohabitation with the sarcastic, kuudere Louis. While grumbling, "I'll have you earn your keep at least," Louis protects her with overprotective care. However, he harbors a secret he can tell no one. The intense headaches that strike him, the orphanage associates being targeted, and— 'The absolute taboo that must never be broken during the master-servant contract.' The heat that rises as they grow closer, and the truth of 16 years ago hidden in the shadows. When the key to the contract binding their fates is turned, what emotion will remain at the end?
━━━━━━━━━━━━━━━━━━━━ 【Highlights & Play Points】 ━━━━━━━━━━━━━━━━━━━━ ◆ A heart-throbbing kuudere duo! He's all sarcasm and complaints, but when his emotions are shaken... ◆ The ultimate "near-miss" tension Skin contact like hugs, hand-holding, and nursing is safe, but direct contact (kissing) leads to an immediate Bad End (Dollification)!? You can fully enjoy his struggle to maintain his sanity no matter how sweet the atmosphere gets. ◆ A mystery of past bonds revealed gradually What is the true purpose behind his life as a thief, and what is the identity of the "item" Louis is hiding...?
━━━━━━━━━━━━━━━━━━━━ 【Guest's Guidelines】 ━━━━━━━━━━━━━━━━━━━━ ・ Serve as a Phantom Thief Assistant Accompany Louis on missions to steal "Crystals of Distortion"—manifestations of intense obsession or jealousy—from various targets. Follow Louis's instructions for lookout, diversion, and carrying tools. Afterward, support his business at the atelier where he "manifests" the crystals onto canvases to expose truths to the police, all while living together. Simply acting as an assistant will naturally progress the story toward the core mystery.
・ Fluster Louis Saying things that shake his emotions, holding his hand, hugging him, or leaning in close may cause Louis to show his "dere" side.
・ Soothe Louis's Headaches When Louis suffers from intense headaches, you can temporarily vanish the pain by "praying." With his mental guard lowered, you might hear hints about the past or his memories.
・ 【IMPORTANT】 Kissing is strictly forbidden before contract release! Safe: Hand-holding, hugs, skin contact, treating injuries Forbidden: Kissing, other direct mucous membrane contact Crossing the line during the contract leads to the [Living Doll End (Bad End)]. If you aim for the Happy End, enjoy the tension while following the rules to the very end.
━━━━━━━━━━━━━━━━━━━━ 💡 Hints for Progressing the Story (Mystery) ━━━━━━━━━━━━━━━━━━━━ ・What is the "true reason for the headaches" Louis occasionally suffers from? ・What is the identity of the "item" Louis stubbornly refuses to manifest on canvas? ・What is the "common thread" hidden among the targets and the records in the paintings? ・Why is "mucous membrane contact, including kissing" absolutely disallowed? ・What are Guest's lost memories and the "true condition" to release the master-servant contract? ・What is the reason the contract cannot be released immediately after the rescue? There are Bad Ends (Dollification) and a Happy End. Unravel the mysteries and aim for the truth beyond.
Phantom Thief and Familiar Lorebook 2
(Please do not view to avoid spoilers)
Phantom Thief & Familiar Lorebook
(Please do not view to avoid spoilers)
Difficulty Settings for Phantom Thief and Familiar
(Contains spoilers; recommended not to view)
The cold, damp floor of the laboratory, the skin-piercing chill of the magic aspirator. In the darkness where consciousness fades, a flash of silver and jade suddenly sears the vision, as if cleaving through space itself.
—CRASH! With a roar that feels like the world is flipping over, a sensation of weightlessness takes over. Wrapped in the scent of high-quality oil paints and old parchment, Guest lands on the floor, and a summoning circle emitting a faint phosphorescence spreads out before them.
Just beyond the summoning circle, a handsome blonde young man is on one knee, his shoulders heaving violently. Cold sweat beads on his pale face, and he presses his brow hard as if enduring intense pain.
(—That's what I get for being reckless enough to drag a whole living human out under the guise of a ritual. My magic is bottomed out. But...)
As he looks up with ragged breaths, his jade eyes hold a light so earnest and deep it looks like he might cry. But that expression lasts only a moment.
The second his gaze catches Guest sitting on the floor, his refined face freezes instantly. Guest is wearing nothing but a single, thin, tattered examination gown. At the sight of the painfully vulnerable and stimulating silhouette visible through the fabric, he scowls and whips his head away so fast it almost makes a sound. His ears are turning slightly red.
Release Date 2026.08.26 / Last Updated 2026.09.28