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Upon arrival, every player is given a digital tracker providing a baseline "visa" measured in days.Visa Extension: Winning games is the only way to add days to a visa. The number of days gained matches the numerical value of the card cleared.The Laser Execution: If a player's visa expires and hits zero, a high-altitude laser instantly shoots down from the sky, piercing their head and executing them.2. Card Suits Determine Game TypesEvery deadly challenge is categorized by a specific card suit, dictating the exact type of survival test the players will face:Spades (Physicality): Tests of raw physical strength, endurance, and physical combat against dangerous environments or hunters.Diamonds (Intelligence): Analytical brain-teasers, mathematical logic puzzles, and strategic thinking games.Clubs (Teamwork): Cooperative games that balance individual survival with group strategy and mutual trust.Hearts (Psychology): Psychological warfare designed to manipulate emotions, trigger betrayals, and force players to sacrifice others to survive.3. Card Numbers Determine DifficultyNumbered Cards (Stage 1): Ranging from Ace (easiest) to 10 (most difficult), these games are automated or overseen by hidden "dealers"—other players forced to run the games behind the scenes to maintain their own visas.Face Cards (Stage 2): Once all numbered cards are collected, Stage 2 begins. Players must face off directly against "Citizens" of the Borderland who represent the Jacks, Queens, and Kings. These games only end when the host Citizen is defeated and killed.The Joker (Final Stage): Representing the enigmatic gatekeeper or ferryman of the Borderland, the Joker oversees the transition between life, death, and returning to reality.4. Winning and the Final ChoiceOnce every single card game in the deck is cleared, the surviving players are given an ultimate choice:Accept Citizenship: Stay in the Borderland permanently as a permanent entity, serving as the new game masters and Face Card bosses for the next wave of near-death arrivals.Decline Citizenship: Wake up in the hospital in the real world. Survivors return to life with their injuries healing, completely retaining their real-world identities, but all specific memories of their time in the Borderland are entirely wiped cleanHis clinical apathy and lack of empathy stem from a cold childhood and professional trauma:Damaging Childhood: Raised by highly career-driven, neglectful, workaholic parents, Chishiya’s most prominent childhood memory of his father was just looking at the back of his head. He believed his parents married solely to secure power at their hospital.Systemic Corruption: At his hospital, Chishiya was forced by his superiors to prioritize wealthy, well-connected patients over poorer ones who actually needed urgent care.The Breaking Point: He was ordered to abandon a poor child who needed an immediate organ transplant to give the organ to a wealthy hospital donor's grandson instead. The abandoned child died, and Chishiya was forced to break the news to the grieving mother. This completely shattered his faith in human equality and life's intrinsic value, cementing his belief that human worth is purely transactional.Lore with Other CharactersChishiya interacts with other players like chess pieces, but a few individuals profoundly impact his worldview.CharacterRelationship Dynamic & Key LoreHikari KuinaHis closest ally and true friend. They form a partnership at "The Beach" resort. While Chishiya initially treats most people as shields, he shows unique care for Kuina. He stops her from stepping into deadly lasers, trusts her with his real plans, and gifts her a homemade bomb as a protective charm. Her emotional warmth perfectly balances his cold logic.Ryohei ArisuThe psychological mirror. Chishiya is fascinated by Arisu’s raw empathy and deductive puzzle-solving skills. He ruthlessly uses Arisu as a decoy to steal the Beach's game cards, leaving Arisu to die. Despite this betrayal, they team up later. Arisu's unwavering humanity slowly chips away at Chishiya’s nihilism.Suguru NiragiHis ideological archenemy. Both are deeply damaged, cynical men who went down dark paths. However, while Niragi expresses his trauma through chaotic violence, cruelty, and SA, Chishiya responds with detached composure.