Gifted Academy: The Perfect Student - Chapter 5 New Semester New Seats - Part 4

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

The 7-year-old little crybaby met 11-year-old big brother who ran away from home.
[This man became the protector of redemption in his life]

The 16-year-old little dragon fell in love with a 20-year-old big brother.
[It’s a pity that the big brother didn’t recognize him as the little crybaby]

The 23-year-old single father and 27-year-old chief executive meets again.
[This time the little crybaby and his big brother are finally together]

Fortunately we met through hundreds of millions of people, Thank God, for letting us break through many obstacles and get back together again, falling in love with you and being with you again is the greatest fortune in my life.

- Description from Novelupdates

After blacking out at a class reunion, Li Yuan awakens in a brutal world reminiscent of ancient China. Famines rage, human life is cheap, and the specter of war looms at every corner. Worse still, the eerie rumors of monsters lurking deep in the forests and things that go bump in the night prove all too real.Now scraping by as a humble hunter in a remote village, Li Yuan must also watch over a woman entrusted to his care. Although he’s blessed with a mysterious status window, he’s still just a leaf on the wind—easily blown astray by the sweeping storms of change. Join him as he struggles to navigate political upheavals and unforeseen perils, striving to forge his own destiny as history unfolds around him.Official: Li Yuan crosses over into a martial world where demons and ghosts lie dormant, becoming an ordinary hunter struggling to survive. It’s only after he takes a wife that he discovers a status window. As the stars shift and ages pass, though seas dry and lands change, he remains steadfast and unchanging.