Demon Slayer: Muzan's Mother Raises the Frail Demon King Again

[Demon Slayer + Healing Family Bonds + Warm and Comforting]

On the day the sickly young son of the Ubuyashiki Family became a demon, his birth mother, Asagao, willingly drank demon blood to join him in eternal night.

The dormant Day Vein in their bloodline unexpectedly awakened, freeing mother and son from the fate of demons. They need not eat humans and fear no sunlight, and can wield the Demon King's power in broad daylight.

To the outside world, he is a cold, arrogant Demon King who controls everything. Before his mother, he will always be Tsukihiko, possessive to the extreme, jealous, and prone to sulking. He can't stand anyone else taking his mother's attention.

The twin heirs of the Tsugikuni Family enter their lives. From mutual dislike and secret rivalry, they grow into a special bond, one where they can trust each other with their backs.

Douma, Hakuji, the siblings from the pleasure district... All those who were destined to fall into the abyss have their fates rewritten by Asagao's kindness.

The Infinity Castle lies hidden in the night, while the Moonlit Garden basks forever in morning light. When the Shadow Wraiths from another realm descend, the Demon King stands shoulder to shoulder with the powerful allies he has recognized, protecting the one place they call home.

Everyone survives, with a healing tone. Contains many original interpretations, so proceed with caution if that bothers you.