Tensei Shitara Slime Datta Ken (WN) - Chapter 356

Demons and Beast descended, terrorizing the whole world for the past hundred years. Everyone can awaken a grimoire and summon a beast during their age of ceremony. Lucas, awakening the weakest grimoire, also awakened the weakest beast- a small dog with no combat capabilities. Fortunately, as a transmigrator, Lucas also mysteriously awakened a system that allows him to evolve his summons into their mythical beast counterpart. Follow Lucas and his journey to greatness as he evolved his beasts into never been before seen mythical creatures.

Ye Qiu transmigrated to a world of barren wastelands. He obtained the 10,000 Fold Return System.

What the hell? That menace who bullied me since I was six years old, actually became a pretty girl after three years of living apart? And she even ran to our agreed duel location to confess to me, hoping that I can become her boyfriend?!

Look at this title. Then look at this cover. Then look at this title. I'm on a horse. You are now a fan of this novel.Why overcomplicate stuff? Just give it a try!(Yes, I'm that confident)