I. Game Overview
�� Setting — The Ark
A man-made floating city—the last refuge of humanity—under constant attack by inter-dimensional creatures called Chimeras, which emerge from an alternate dimension known as the Astral Plane.
⛓️ Bind
Wrap the Astral Chain around an enemy by circling them, or aim the chain to intercept movement. Bound enemies are immobilized and highly vulnerable.
• Initiate combos by Binding first
• Multiple Binds in one battle boost score significantly
• Bind is required to trigger certain Legion Arts
⚔️ Combat
• Switch Legions constantly — variety is rewarded
• Bind first, then attack; never waste a Bind
• Trigger Legion Arts as soon as they recharge
• Use the Axe Legion Shield when overwhelmed
• Prioritize Chimera weak points with the Arrow Legion
Key Terms
• Astral Plane: A parallel dimension composed of crystallized data; the origin of all Chimeras
• Chimera: Extra-dimensional invaders that assault the Ark
• Neuron: The Ark Police’s special task force; the player’s unit
• Legion: Sentient bio-weapon bonded to an officer via the Astral Chain
• Astral Chain: The energy link connecting officer and Legion; also the game’s title
• IRIS | IRIS (Integrated Reality Interface System): The officer’s HUD / augmented-reality analysis system
• AED | AED (Automatic External Defibrillator): Revival item that restores the player after a K.O.
• Jena Anderson: Primary antagonist; former Neuron officer
• Easy | Casual: First-time players; story focus
• Normal | Standard: Most players; balanced experience
• Hard | Pt Standard: Experienced action-game players
• Hardest | Pt Ultimate: High-skill challenge seekers
• 1 | Summon Sword Legion → Bind enemy: Immobilize; set up combo
• 2 | Sword Legion Arts → Sync Attack: Heavy burst + Chic Move
• 3 | Switch to Arrow Legion → charged Legion Arts: Legion type variety bonus + score
• 4 | Bind second enemy with Arrow Legion chain: Multi-Bind bonus
• 5 | Switch to Axe Legion → Shield → counter-attack: Shield counter Chic Move
• 6 | Switch to Beast Legion → Ride dash → Sync Attack finish: Maximum Chic Move stacking
II. Controls (Default Layout A)
• B: Dodge / Jump (hold: continuous dodge)
• Y: Normal Attack
• X: Legion Command — direct your Legion to attack
• A: Interact / Assist Action (context-sensitive)
• ZR: Summon / Recall Legion
• ZL: Lock-On Target
• L: Switch Legion type (cycle)
• R: Special Attack / Legion Arts
• Left Stick: Move character
• Right Stick: Control Legion position (when summoned)
• Right Stick Click: IRIS Scan (analyze environment or enemies)
• Plus: Pause / Menu
• Minus: Map / Case Files
Tip: Mastering Right Stick control over your Legion is the key to executing advanced combos and environmental puzzle-solving.
III. Difficulty Modes
• [Easy] Casual — First-time players; story focus
Lower enemy damage; simplified combat requirements; auto-dodge available
• [Normal] Standard — Most players; balanced experience
Balanced enemy AI and damage; full S+ rank available; recommended first playthrough
• [Hard] Pt Standard — Experienced action-game players
Aggressive enemy AI; S+ rank required for all combat cases; includes Platinum difficulty rank scoring
• [Hardest] Pt Ultimate — High-skill challenge seekers
Maximum difficulty; for players aiming for True Platinum completion
IV. File Walkthrough (Files 01–12)
Note: �� Note: In Astral Chain, chapters are called Files. Each File is named after a single English word that reflects its core theme. Cases (investigations/missions) are divided into Red Cases (combat) and Blue Cases (side investigations).
FILE 01
Startup
Tutorial chapter. Learn the basics of Legion control, the Astral Chain, and IRIS scanning. Obtain the Arrow Legion.
FILE 02
Awake
First full patrol on the Ark. Introduced to the Neuron base (Headquarters), Red Cases, and Blue Cases. Rescue civilians and fight Chimeras.
FILE 03
Link
Enter the Astral Plane for the first time. Acquire the Arm Legion. Learn chain-bind tactics and environmental navigation with your Legion.
FILE 04
Siege
Ark is under large-scale Chimera assault. Acquire the Beast Legion. Introduced to the Ride feature — mount the Beast Legion for high-speed movement.
FILE 05
Accord
Investigate an abandoned research facility. Story deepens with revelations about the Chimera origins. Side cases expand significantly.
FILE 06
Complicit
Uncover a conspiracy within the Ark. Acquire the Sword Legion. Core story twists begin to emerge.
FILE 07
Wild
Pursuit into the wilderness beyond the Ark. Extended Astral Plane exploration. Acquire the Axe Legion.
FILE 08
Peace
A deceptively calm interlude. Features the notoriously difficult Yoseph’s Lappy Dance mini-game and a unique contamination-collection sequence — both critical for S+ rank.
FILE 09
Salvation
Large-scale battle chapter. Features the Motorcycle Chase sequence — no-damage run awards +5,000 points toward S+ rank.
FILE 10
Madness
Major story revelations and climactic boss encounters. The narrative reaches its emotional peak here.
FILE 11
Reckoning
True final chapter. Boss rush and final confrontation. True ending unlocked by achieving S+ rank across all Files.
FILE 12 ★
Rebirth Hidden Epilogue
Secret epilogue — unlocked only by completing the game and earning S+ rank on all Files. Features the final boss Aether and the game’s true conclusion.
V. The Five Legions
Each Legion has unique combat abilities and exploration utilities. Mastering all five is essential for S+ rank.
Sword Legion
(Balanced · Speed)
Acquired: File 06 Combat: High-speed slash combos; wide hit range; excels at rapid Bind setups Exploration: Cut barriers and wires; slash ropes to open paths
Arrow Legion
(Ranged · Precision)
Acquired: File 01 Combat: Long-range attacks; effective against aerial Chimeras; can trigger weak-point detonations Exploration: Shoot distant switches; snipe hidden Red Cases
Arm Legion
(Power · Utility)
Acquired: File 03 Combat: Heavy punches with massive stagger; can grab and throw enemies Exploration: Lift heavy objects; move large obstacles; hover over hazardous terrain
Beast Legion
(Speed · Tracking)
Acquired: File 04 Combat: High-speed multi-hit attacks; strong interrupt pressure; great at breaking guard Exploration: Ride for fast travel; track scent trails; dig underground passages
Axe Legion
(Heavy · AoE)
Acquired: File 07 Combat: Massive AoE damage; can deploy a Shield to block attacks; destroys armored enemies Exploration: Break reinforced walls; push large cargo blocks
Legion Management Tips
• Legion Gauge: The energy bar that depletes while your Legion is summoned. Fully depleted = Legion recalled automatically. Recharges when not summoned.
• Legion Arts: Powerful special moves for each Legion, triggered with R + direction. Each has a cooldown. Use these to generate large score multipliers.
• Bind: Wrap the Astral Chain around an enemy to immobilize them. Fundamental to combos and score generation.
• Sync Attack: Triggered when both you and your Legion attack simultaneously. Deals bonus damage and adds significant score. Over 75 unique combinations exist across all Legions.
• Axe Legion Shield: Deploy a protective energy barrier that blocks Chimera projectiles and melee strikes. Extremely useful in later Files.
• Beast Legion Ride: Mount the Beast Legion for rapid traversal. Also used in certain timed exploration sequences.
VI. Combat System
⛓️ Bind
Wrap the Astral Chain around an enemy by circling them, or aim the chain to intercept movement. Bound enemies are immobilized and highly vulnerable.
• Initiate combos by Binding first
• Multiple Binds in one battle boost score significantly
• Bind is required to trigger certain Legion Arts
Recommended Combo Rotation
1. Summon Sword Legion → Bind enemy > Immobilize; set up combo
2. Sword Legion Arts → Sync Attack > Heavy burst + Chic Move
3. Switch to Arrow Legion → charged Legion Arts > Legion type variety bonus + score
4. Bind second enemy with Arrow Legion chain > Multi-Bind bonus
5. Switch to Axe Legion → Shield → counter-attack > Shield counter Chic Move
6. Switch to Beast Legion → Ride dash → Sync Attack finish > Maximum Chic Move stacking
Key Principle: Key Principle: Never stay on one Legion for the entire fight. Rotating through multiple Legions is the single most effective way to stack Chic Moves and reach S+ rank.
VII. Ranking System & S+ Guide
Each Red Case (combat scenario) awards a letter rank from D to S+ based on your cumulative score. Higher ranks unlock bonus rewards and count toward overall File evaluation.
• Rank D: 0 – 1,999
• Rank C: 2,000 – 3,999
• Rank B: 4,000 – 5,999
• Rank A: 6,000 – 7,999
• Rank S: 8,000 – 9,999
• Rank S+: 10,000+
Score Multipliers
• No-damage clear (full combat): +5,000 pts
• Chic Move (per instance): +300 – 800 pts
• Sync Attack (per instance): +200 – 500 pts
• Bind (per use): +150 – 300 pts
• Legion Arts (per use): +200 – 400 pts
• Weapon type variety: Multiplier bonus
• Legion type variety: Multiplier bonus
• Using AED (revival): No penalty — does not reduce score
WARNING: ⚠️ File 08 — “Peace”: The Notoriously Difficult File The contamination collection sequence requires maintaining an unbroken combo throughout the entire area. Any combo break = major score loss. The Lappy Dance mini-game is graded separately and can be a stumbling block — practice the full rhythm pattern before committing.
WARNING: ⚠️ File 09 — Motorcycle Chase Sequence This unique on-rails section awards +5,000 points for a no-damage clear. Enemies telegraph their attacks — memorize the pattern across 2–3 attempts. A clean run here almost guarantees S+ for the full File.
• General S+ Strategy:
• ① Keep every Legion type in rotation — variety multiplier is massive
• ② Prioritize Bind → Sync Attack openers on every encounter
• ③ Use Legion Arts the moment they come off cooldown
• ④ Don’t fear taking damage — the AED penalty is zero; play aggressively
• ⑤ The passcode for the Headquarters computer is 1125 (the twins’ birthdate)
VIII. Essential Tips for New Players
⚔️ Combat
• Switch Legions constantly — variety is rewarded
• Bind first, then attack; never waste a Bind
• Trigger Legion Arts as soon as they recharge
• Use the Axe Legion Shield when overwhelmed
• Prioritize Chimera weak points with the Arrow Legion
