1 World Setting

After midnight, Seoul reveals a second city visible only to those bound by invisible debts. VIP booths become altars, corporate contracts bind souls, and idol agency agreements imprison spirits. You're a young man dragged into supernatural debt — survive three nights and find out who wrote your name in the Night Board's ledger.

Key environments: Chaebol Penthouse Banquet / Moonlit Cathedral Boardroom

Nightclub ritual chamber and environment concept sheet (Mirror Backstage, Rooftop, Apartment, Cathedral)

2 Card & Combat System

Slay the Spire-inspired combat: draw cards each turn, spend energy to play attacks/blocks/skills, manage deck through rewards and shops. Two core resources drive risk: Affection scales your power but triggers jealousy across allies; Contract gives explosive cards but drains your life.

Card art — Neon Cut (attack), Red Room Feint (evasion), Exorcism Live (purification)

More card art — Paper Talisman, Black Card, Backstage Pass, Oracle Reversal

Card shop interface: purchase cards, relics, and services between encounters

3 Enemies & Chapter Design

Three chapters, each with unique thematic enemies, elite bosses, and corruption modifiers. The roguelike map includes combat nodes, character events, confession rooms, shops, contract altars, and multi-phase bosses.

Protagonist combat sprite sheet (16 frames) / Neon Wraith — Chapter 1 elite boss

4 Relationship Network

6 characters, each tracked across 7 dimensions: affection, jealousy, trust, secret progress, route stage, betrayal risk, and flags. Favor one ally and others grow jealous — above threshold, they confront you in combat. The party system uses 3 slots: Main Partner, Side Partner, and Support.

Red Thread (relationship binding card) / Neon Rosary (hidden character unlock relic)

The ending resolver checks 8 conditions in strict priority: betrayal ending, harem collapse, single-route true end, contract overload, purification path, hidden character route, neutral escape, and bad end. Each requires a unique state combination — no two playthroughs end the same way.

Moon Contract (seal relationship permanently) / Covenant Reset (break all bonds, restart path)

5 Roguelike Systems

Each run generates a unique path through combat, events, and shops. Character events, recruitment moments, and confrontation scenes are all data-driven — no hardcoded content. The game ships with 31 JSON data files totaling 31,588 lines.

• 153 cards across 5 archetypes + 12 synergy cards (activate when specific character pairs are together)
• Roguelike map: combat, elite, event, confession, shop, altar, boss nodes per chapter
• 13,310 lines of branching visual novel dialogue (Chinese + English)
• Per-run corruption affixes create unique rule variations every playthrough
• Dual currency tension: Affection (power) vs Contract (risk) — every card choice is a trade-off

Relics & late-game cards: Red Lacquer Case, Velvet Finale, Final Invitation

6 Built by AI Agent

The entire codebase — 10,551 lines of GDScript across 12 modules — was generated by Claude Code from 8 handwritten design documents. Human provided creative direction; AI handled architecture, code generation, data balancing, and cross-file QA.

Cyan = AI-generated relationship network modules