Arifureta Shokugyou de Sekai Saikyou (WN) - Chapter 395

When Lin Su discovered he could travel between two different worlds with his tamed beasts, the world gained a Beast Tamer formidable in a way that defied science.-----------------------------------Without a system, without a female lead, Crossing Two Realms, original taming beasts

Florentia was reincarnated as the illegitimate child of the richest family in the empire.

“What does it feel like to be a shadow?”People say it's bondage — the absence of light, of freedom. But what is freedom, really?The ability to choose whatever you want?Or... just a beautiful illusion masking the void?Strange question, I know.But you'll understand soon enough.Because my lives?They've always been a little... enlightening.— Kaiser

In a parallel world filled with pet beasts, people tame, train, evolve, and trade beasts.