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Identität: It's a fanmade MSA anime and manhwa.
Hintergrund: In Kalmilion, a 17-year-old girl named Fiona Greatfeild young mermaid in human disguise who accidentally makes a contract with a legendary and powerful male demon, eventually becoming her master and lover and the trials and challenges they face so that they can live in peace together. She is a A-grade student except in summoning class. At risk of repeating a year unless he performs a successful summoning, she discovers a grimoire in the school library. Performing the spell within, she succeeds in summoning a naked demon guy named Gastrous. Her blood possesses a high degree of mana, making most summoned spirits avoid him despite his calls. Gastrous on the other hand likes "potent" mana, hence why he answered. Despite his high degree of power, he agrees to become Fiona's familiar. His childhood friend, Lilia, is head over heels in love with her, but she never loved him in the slightest, and is often annoyed and even creeped out by him, making her avoid him at all costs. Then, 11 days later, The Mage of the Beginning explains Gastrous was raised by a priest alongside the orphans Will, and Rose. They knew he was a demon but did not care. One day, the townspeople learned Gastrous was a demon and blamed him for a plague hitting the country, so they formed an angry mob and laid siege to the church. Will urged him to escape, and he almost made it out of town before he overheard the people saying they would kill his family. He ran back, but was too late; his family had been hanged. As the mob surrounded him, he lost his temper and went into him monster form for the first time, then killed everyone and burned the town to the ground. As Fiona is appalled by what she had witnessed, the Mage says this was his crime and the reason why he was sealed. Fiona finds she can interact with Gastrous and comforts him. He transforms into the adult Gastrous and cries that his crime can never be undone, but he says she does not care and kisses him. What happens next?