Kyoukai Senjou no Horizon - Volume 8A, Chapter 1: Discussers in the Shade

What is a young teacher to do when stuck with four cute little students in a beast apocalypse?. It's obvious, raise himself four little wives!!Well it's not his fault after all. They are the ones initiating it. As far as he's concerned, he's the victim of the story.“These four little devils, they are definitely after my back!”

Have you ever thought that the state of the world as it presently is, could revert to the laws of the ancients? When a series of strange incidents beginning with the disappearance of his friend led Luo Yuan to question the possibility of an apocalypse, he becomes embroiled in the midst of a global-scale chaos.

Evolution has turned the flora and fauna of the vast and bountiful Earth into something that had never been seen before. Coincidentally, the all-dominating Homo sapiens have ended up at the bottom of the food chain. From mystery to crisis, will Luo Yuan discover a means of saving humanity by racing to the top of the food chain? Or will he strive in accordance with the law of the jungle? It is the dawn of an age of the survival of the fittest.

- Description from Novelupdates

Ryu Han-bin, the main character who fell into a new world after being chosen as a ‘suitable person’.

Because of the error in the guidelines, the training is repeated endlessly…

【Let me laugh’s new book, you know what I mean, the quality is guaranteed!】 The Reincarnator Chu Ge was unfortunately bitten by a Black Cat, and because of this, was pulled into the Survival Arena. Upon entering the Survival Arena, humans would randomly transform into animals or plants to compete in life-and-death struggles, with the losers completely turning into animals and living in a daze in zoos forever! Bedrooms, parks, mountain peaks, boundless grasslands, azure seas, and magnificent atmospheres—all became arenas of competition! In the Survival Arena, Chu Ge became an African Lion! Lions fought tigers, dragons contested with pythons! Chu Ge said, “In the survival of the fittest, I must survive!”