Douluo Dalu 2: The True God King - Chapter 159: [DD2]:

Ye Qing transmigrated into a novel. She was only an unimportant character in the novel, and she was free to live a wonderful life by herself.

But, her happiness was short-lived. One day, an adorable girl that looked around three-year-old popped up and called out in a milky voice, “Mom.”

Ye Qing: ???

On another day, a cute and handsome twenty-something guy hugged her. With tears in his eyes, he said in a voice that was full of affection, “Mom!”

Ye Qing: ???

After Ye Qing had somehow inexplicably become the mother of two children, she discovered –

Neither of these children were human!

***

One day, a little girl pulled a certain big boss to the side to whisper, “Dad, mom was patting my head when she was telling me a bedtime story. I felt too comfortable, and I accidently swung my tail out. Mom seems to have seen my tail. What should I do? QAQ.”

- Description from Novelupdates

Side story of Kyoukai Senjou no Horizon bundled with the first press release of the 1st, 3rd, 5th and 7th Blu-ray volumes of both seasons of anime.

This side story follows Asama, Kimi and Mitotsudaira aboard Musashi one year before the beginning of the main story, as Asama is considering to create a music band together with her two friends for the next festival in Aki, a territory under the governance of K.P.A. Italia.

“How long has it been?”10,000,000 Years, a period of time which he dwelled in the endless abyss as a captive of war.After his fall, he lost everything to the hands of those who stand above the heavens.The twelve gods of the constellations, the Primal Zodiacs!Creatures who descended down from the absolute light to consume all.He fought against them only to fall prey to their destruction, locked away in the endless Abyss.Astroth Vermont lost it all, his will, his empire, his powers and his mind, all he knew was despair.But that’s until he woke up, Returning back to the world as someone else.The Blackest Evil was reincarnated as the Tenth Young Master of the Reinhart Family.His return is going to shape the world, returning all into chaos!Will he exact his revenge?Who knows, welcome to the land of carnage

After suffering so much on earth, Liam died with his heart filled with hatred for heaven and humans.....

At the great void of reincarnation, he disobeyed a god and entered a different reincarnation portal....

He was reborn in a new world, possessing immersive bloodlines abilities....

With this he have finally started his journey of going against the heavens..