SSS Ranked Reincarnation: Dark Dragon Legacy - Chapter 12: Giant Slimes

After transmigrating into a beast world, Rong Mingshi discovered that the people of this world experienced widespread mania. For example, when their emotions were abnormally agitated, they would become destructive beasts. If their emotions were abnormally low, they would shrink into their young beast form.

Xiao Xin, a Pokémon’s diehard powder, accidentally succumbed to death while using the game modifier, the soul passed through the Pokémon world, a child who accidentally swallowed a lightning stone in thunderstorms and was strangled by lightning.

On the body, the most important and most important, he also brought his props backpack in the game…

- Description from Qidian

Ukei Kaito fought a desperate struggle in order to fulfill his role as a summoned hero. He defeated the Demon Lord and saved the very world, only to meet an end filled but with betrayal. The companions that he’d trusted throughout his journey betrayed him and killed him by sticking a blade through his chest.

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.