Guide to Failing as a Full-Level Green Tea - Chapter 103 - Ill Stay with You Tonight

From a stumbling lion cub to a majestic lion king, he imagines that his life as a lion would peak and end with him owning a vast territory, dominating the grasslands, terrifying all his enemies while having many wives and concubines.

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

A world where magic beasts went extinct… until technology revived them!David wakes up in the middle of a Hatching Ceremony in the body of Jethro Merrick, clutching the lowest ranked egg.Now he’s living the life of a poor mechvet’s son, dreaming of adventure as a Riftwalker (think monster taming and dungeon clearing… but with cybernetic beasts!).But dreams crash fast. His egg hatches into a Red Lizard—cute but powerless and only used for pest control. Just as Jethro resigns himself to a boring life, a wrong turn during a Rift Training expedition lands him in a forbidden Rift zone.He barely escapes alive… only to wake up with a supercharged power: he can see the magic and mechanics of every mechbeast, right down to their origins!Here’s the catch: the ancient conqueror who once had this power wants it back, and he’s bringing an army of terrifying mechbeasts to take it.To survive, Jethro must build an army of his own, starting from his powerless frail lizard. But can a pest-control pet (and its rookie human) save the world?Let’s hope so, because our dear world of Nebulon desperately needs saving!