The Extra's Return - Chapter 27 Demonic Mana

In a Fantasy world in which a young girl with the Divine Protection of the Hero battles against the Demon Lord. In that world, Red, the elder brother of that young girl Hero, possessing the Divine Protection of the Guide which only grants a high initial level, fought in the initial party of the Hero.

Ethan Carter, a failed office worker from his past life, wakes up as the spoiled heir of the Carter family—a young man infamous for his laziness and scandals. Armed with the Cheat Investment System, which can predict future market trends, Ethan sets out to transform his life from a disgrace to a legend.As he climbs the ladder of success, Ethan must face ruthless rivals, scheming family members, and the brutal corporate world. With each step forward, his empire grows larger, but so do the stakes. Will Ethan use his newfound power to crush his enemies and secure his legacy, or will his ambition lead to his ultimate downfall?Follow Ethan’s journey from a “worthless heir” to a world-changing tycoon in this epic story of wealth, betrayal, and redemption.

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

The sky was painted gray forever. The light of the sun was restrained. The darkness of the night was deeper than ever. At such a time, he belonged to a class people didn’t even recognize as ’human’. He was at the bottom of the social stratum, a slave. And when his only family was taken away from him... he no longer had a purpose in life. Yet, he clung to life because of his promise. And he set an impossible goal for himself, just so he’d have an excuse to live. When he finally reached a place he never expected to be, in pursuit of a purpose he expected to fail and die miserably trying to fulfill... he awoke to a night that would change his entire life. He was an insignificant fly, a mere speck in the destruction of the Empire. But he... survived. And, despite being a slave, he gained the blessing of a king. Or rather, the curse...