Black String of Fate - Chapter 88: Pure Nature Spirit

The sky thunders, Fang Yue, the nail household, dies on the street, the heavenly court blackmails, obtains compensation, reincarnates, and sees how Fang Da Devil disturbs the universe and upset the world.

- Description from MTL

Childhood sweethearts.
The most popular person in school is my childhood sweetheart.

- Description from Novelupdates

[ Fusion Successful ][ Water Toad + Sky Dragonfly + Nightmare Moth + Bluefang Hyena= Nightmare Hydra ]----Yuki Igarashi, once a terminally ill boy confined to a hospital bed, dies with a silent wish for strength and freedom.That wish is mysteriously granted when he reincarnates into a fantastical new world. Not as a human, but as a newborn Frost Dragon.With his memories intact and curiosity alive, he is soon greeted by a mysterious system called the Dragon God System, which mistakenly binds itself to him, claiming he is not its original host. Still, it is now eternally bound to him.Despite his infant form and weak body, Yuki discovers he can extract bloodlines and skills from other creatures using the Dragon God Codex, and fuse them within a mysterious space called the Fusion Lab.Even more shocking, a glitch in the system allows him to repeatedly Fuse bloodlines without depleting them, opening the door to limitless growth.

Going back to the beginning of 2006, he became the head coach of Real Madrid. All of his men are superstars with great reputation in the world, such as Ronaldo, Zidane, Raul, Beckham, Casillas, Carlos, Ramo. Si… all of them are ruthless characters who can make the world football tremble by stomping their feet.

How can a humble rookie train these rebellious superstars?

- Description from novelbuddy