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link=Category: This article covers a complete plot summary.
The contents within will contain major spoilers. Reader discretion is advised.

This is a complete summary of the story of the Devil Children manga.

Chapter 1: AD 2000.7 Early Winter

The story begins in Ice Land, where a man named Moon flees a horde of Nightmare Demons while carrying a parcel. Moon fears he is running out of time, exclaiming the parcel is meant for the Devil Child who will gather the "seven horns" and save the world.

Meanwhile in the Real World, the date is July 31, 2000, 2:06 PM. Setsuna Kai loses a kendo match against Mirai Kaname, sparking a heated argument between the two. Their friend Zett Takajō tells them to stop fighting, and reminds Setsuna that his mother Tsubomi is watching over him. Zett refers to Setsuna's pendant, which his mother gave to him as a child before she passed away. Since then, Setsuna has vowed to become strong.

As the three walk home, snow falls upon the city, which has been happening across the world since the day before. Setsuna wonders if it is the work of ghosts, but unbeknownst to the kids, the Nightmares from Ice Land secretly observe them. Setsuna retreats to his apartment to warm up, when suddenly, Moon crashes through the wall, hands over the parcel, and dies. Nightmare then enters the apartment, addressing Setsuna as the Devil Child possessing a Messiah's Horn. Grabbing a broken piece of wood, Setsuna strikes Nightmare's neck, only to have it turned against him and stabbed through his heart. Nightmare takes the Messiah's Horn, the true name of Tsubomi's pendant, causing Setsuna to erupt with rage. As a pentagram flares on his forehead and his wounds get miraculously healed, he quickly reaches for Moon's parcel. The packaging erupts into flames and transforms into a Deviliser, which Setsuna fires at Nightmare, blasting him out of the apartment.

In firing the Deviliser, Cool the Cerberus appears before his new master. He tells Setsuna that the unnatural weather is due to Demons from Makai, the Demon realm, and how Makai and the Real World are both in peril. To save both worlds, a Devil Child must gather the seven Messiah's Horns. Setsuna is reluctant to fulfill such momentous duties, being a mere elementary schooler, until Nightmare returns to kill him. Cool gets injured by Nightmare's Zan spell, calling for his master to be brave and hone his powers. Motivated by wanting to become stronger, Setsuna open a rift to Makai using his Messiah's Horn, while Cool fights back using Agi. With Nightmare held off, Setsuna and Cool leap into the Makai rift. Mirai overhears the conflict from her room, smirking with confidence. As for Zett, he sees explosions coming from his friends' apartment complex, and enthusiastically says "Game Start."

Chapter 2: Excessive Expectations

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Chapter 3: White and Blood

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Chapter 4: Straight to Hell!!!

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Chapter 5: Those who Shed Tears

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Chapter 6: A Calm and Quiet Place

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Chapter 7: Wandering People

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Chapter 8: Outbreak of War

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Chapter 9: Path to Destruction

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Special Manga: ChilTalk

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Chapter 11: Dark Forest

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Chapter 12: Dearly Beloved

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Chapter 13: Ominous Warning

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Chapter 14: Future in Motion

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Chapter 15: Domination

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Chapter 16: To the World and Friends

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Chapter 17: Those Worthy of Living?

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Chapter 18: True Colors

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Chapter 19: Relentless Anger

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Special Manga: ChilTalk Red Book Rip-off

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Chapter 21: A World on the Bound of Darkness

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Chapter 22: Final Point

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Chapter 23: And Now, to the Ultimate Fight...

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Chapter 24: The Dark Opernball

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Chapter 25: Journey of Light and Darkness

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Chapter 26: Final Evolution Zwei

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Chapter 27: Only One Truth

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Chapter 28: The End and the Beginning

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Chapter 29: Peace Be With You

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Special Manga: ChilTalk if....

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