This is a world where high technology and magic coexist, and humans live alongside supernatural beings.
Yulien is just an ordinary person with nothing special about her. As the eldest daughter in her family, she inherits the cake shop.
Her ordinary life is shattered by a sudden crisis.
A monster has appeared in the castle on the mountain, powerful, mysterious, and terrifying. Rumor has it he wields the darkest power and will one day destroy the world.
Countless mages have been defeated by him, and the armies sent to capture him have returned in disgrace.
Yulien ventures into the castle alone and meets a pair of arrogant, contemptuous eyes.
In the darkness, she signs a contract to capture the monster: she must find the treasure he cherishes most and take it from him.
World One: Cursed Monster × Chief Mage
The mass of black mist in the transparent containment tank is the most mysterious monster at the magic academy. It has been asleep for a hundred years.
No one knows the monster has already awakened. It has set its sights on the kingdom's chief mage.
In her bedroom, Yulien sleeps without a care. The black mist takes human form, its blood-red eyes watching her day and night.
"Is that emptiness in my stomach hunger... or curiosity?"
World Two: Shapeshifting Test Subject × Princess
The test subject hasn't learned how to control his body yet. He keeps turning into strange things, from furniture to animals, and even the manga characters Yulien just read about...
Yulien returns to her bedroom to find a slime sprawled across her bed, its goo dripping onto the floor. He desperately hides beneath the blanket, refusing to let her see him, yet can't help reaching out with a transparent tentacle to wrap around her ankle.
"Do you hate how I look... Don't say you do."
World Three: Off-Key Mermaid × Genius Marine Biologist
The mermaid has a pair of deep blue eyes, like the ocean depths, inviting anyone to explore them. He is the last mermaid in the world, proud and lonely. No one has ever heard him sing.
Except for the young marine biologist.
But the mermaid's song means not only that he is falling in love, but also that danger is near.
"Don't break your chains. Wouldn't it be better to stay here forever? I'm your research subject, so why are you looking at someone else?"
World Four: Dramatic Elf × Wealthy Merchant
Though he is in a chaotic, brutal auction house, bound by heavy chains, the elf in the cage still has a cool, saintly air, as if nothing could sully him.
The first person he sees is Yulien in the audience.
"What do you want? I'll give you anything, except the monster's power."
World Five: Sentient Machine × Villager from a Primitive Settlement
The sentient machine who awakened to emotions belongs neither to humanity nor to his own kind, who have cast him out. He longs to have a beating heart, just like a human.
At last, he gets a mechanical heart installed.
But when danger threatens the settlement, the proud monster bows his head, willingly giving up all his power... and his heart.
"I will only let her hurt me. I'm willing to give her my heart."
Theme: Break free from the prison of fate