The Damned Demon - Chapter 346 No Different Than Demons

A 30-year-old NEET is reincarnated into the body of an otaku that choked to death on instant noodles. As he comes to grips with his new life, he realizes that this world is subtly different from Earth. The denizens of this world are far better looking, and this new world also possesses futuristic technology as well as mysterious Yin Yang masters!

“O, Hero!” With that cliched line, Kazuya Souma found himself summoned to another world and his adventure–-did not begin. After he presents his plan to strengthen the country economically and militarily, the king cedes the throne to him and Souma finds himself saddled with ruling the nation! What’s more, he’s betrothed to the king’s daughter now…?! In order to get the country back on its feet, Souma calls the wise, the talented, and the gifted to his side. Five people gather before the newly crowned Souma. Just what are the many talents and abilities they possess…?! What path will his outlook as a realist take Souma and the people of his country down? A revolutionary transferred-to-another-world administrative fantasy series starts here!

To be exact, the female lead is an “older sister” type, amid many beauties and handsome guys, she's no white lotus.Also, it's said that the name of this book is the same as a brand of sheep's milk powder.

After being betrayed and killed by his own brother, 17-year-old orphan Elias Black is given a second chance—by a mysterious, demonic entity. Reborn with the “Devil’s System,” he must now collect souls, gain abilities, and exact revenge on those who ruined him.But each power comes with a cost—and the devil never makes a deal without expecting something in return.As Elias grows stronger, unlocking deadly skills and forming uneasy alliances, he faces an even darker truth: his rebirth is part of a much bigger, bloodier plan.