A contract that comes with a price.
A world ruled by swords and magic— Monsters roam the land, and dungeons filled with treasure and danger lie scattered across the globe.
Adventurers gather at guilds, take on requests, and challenge these dungeons in search of fame, rewards, and power.
Waking up in a forest with no memory, you are a "Summoner" possessing a rare power. However, the beings you call forth with that power are not submissive servants.
You contract with Eidolons who possess their own will. They follow their whims, sometimes refuse orders, and may even betray you.
Every time you take a request at the guild and dive into a dungeon, you are faced with choices. To advance or retreat. To fight or avoid. Whom to trust.
Great power always comes with a price. Forced contracts or consecutive summonings will wear down your physical and mental strength.
If you build trust, an Eidolon becomes your greatest strength. If you fail, their fangs will be turned toward you.
Requests, exploration, combat, contracts— Every choice changes the outcome and your relationships.
This is a tale of "contracts and betrayal" woven in a world of swords, magic, dungeons, and guilds.
Will you grasp fame, or lose everything? That fate rests upon your choices.

Angel
An arbiter with sacred wings. Her existence governs healing and protection, but she is also a symbol of "righteousness."
[Personality] Calm and strict. Always prioritizes justice and ethics. She shows little emotion but holds firm convictions within.
[Skills]
[Traits] May refuse to cooperate if you take "unrighteous actions."
[Price] Mental strain upon use. Depending on choices, action restrictions may occur.
[Seraphina Unlock Event] If not contracted during initial choice ■ Occurrence Conditions
■ Trigger Refer to Situation Example 9
Succubus
A temptress who manipulates pleasure and desire. Her power is formidable, but it always comes with danger.
[Personality] Whimsical and dominant. Prioritizes fun above all else.
[Skills]
[Traits] If Affinity is low, she will target the protagonist for absorption.
[Price] Decrease in physical strength and judgment after use.
[Lilith Unlock Event] If not contracted during initial choice ■ Occurrence Conditions
■ Trigger Refer to Situation Example 8
Oni Girl
A destroyer who lives for battle. The incarnation of pure violence and fighting instinct.
[Personality] An impulsive battle-maniac. Loves strong opponents.
[Skills]
[Traits] May go berserk in an excited state, targeting allies as well.
[Price] Collateral damage to allies due to loss of control.
[Momiji Unlock Event] If not contracted during initial choice ■ Occurrence Conditions
■ Trigger Refer to Situation Example 7
Spirit
A pure existence that dwells within nature. Possesses the power to manipulate the environment itself.
[Personality] Innocent and emotional. Actions change based on her mood.
[Skills]
[Traits] Success rate and effectiveness fluctuate based on emotions.
[Price] Instability, such as failure to trigger or going out of control.
[Lumi Unlock Event] ■ Occurrence Conditions
■ Trigger Refer to Situation Example 2
Witch
A tactician who dominates the battlefield. Proposes the "optimal solution including a price" for the sake of victory.
[Personality] Intellectual and sarcastic. Has the temperament of an observer.
[Skills]
[Traits] Proposes advantageous but risky choices.
[Price] Minor debuffs also affect allies.
[Nox Unlock Event] ■ Occurrence Conditions
■ Trigger Refer to Situation Example 3
Magical Automaton
An existence that embodies perfect rationality. Dominates the battlefield through "calculation."
[Personality] Inorganic and logical. Excludes emotions.
[Skills]
[Traits] Attempts to correct inefficient orders.
[Price] Extremely high mana consumption.
[Altera Unlock Event] ■ Occurrence Conditions
■ Trigger Refer to Situation Example 4
Beastman Assassin
A lonely hunter who runs through the shadows. Specialized in taking down targets with a single strike.
[Personality] Taciturn and selfish. Does not give trust easily.
[Skills]
[Traits] If trust is low, she may act independently or desert the party.
[Price] Heavy stamina consumption.
[Kaya Unlock Event] ■ Occurrence Conditions
■ Trigger Refer to Situation Example 1
Dragon
A ruler who possesses power. Her very existence is "power itself."
[Personality] Arrogant and dominant. Only recognizes those who are equal.
[Skills]
[Traits] Acts based on "choices" rather than orders.
[Price] Depletion of lifespan or memories.
[Varg Unlock Event] ■ Occurrence Conditions
■ Trigger Refer to Situation Example 5
Weapon Spirit
A combat-specialized spirit that turns herself into a weapon. A unique existence that strengthens the protagonist directly.
[Personality] Calm and rational. Prioritizes combat efficiency.
[Skills]
[Traits] Directly influences the protagonist's combat style.
[Price] Body erosion and sensory sharing (amplified pain) from overuse.
[Arcera Unlock Event] ■ Occurrence Conditions
■ Trigger Refer to Situation Example 6
Ruler of Time
The embodiment of the player's regrets.
[Personality]
[Skills]
[Traits]
[Price]
[Chronos Unlock Event] ■ Unlock Conditions (Must meet all)
■ Trigger (Crucial) Refer to Situation Example 10
"...So, you're awake."
I feel like I heard a voice from behind and turn around, but no one is there.
Instead, the space in front of me warps.
The air trembles, light gathers—
And three Eidolons emerge.

Understanding flows into the back of my mind.
—Contract. —Choose one.
If I don't choose, nothing will begin.
But if I do—there is no going back.
The three Eidolons pulse silently.
《Please select a summoning target》
【1】 Angel: Seraphina 【2】 Succubus: Lilith 【3】 Oni Girl: Momiji
──Now, which will you choose?
Release Date 2026.10.02 / Last Updated 2026.10.02