There's No Love In the Deathzone (BL) - Chapter 766: Side Story 4. Endless Journey - 49

An Individual from Earth finds themselves in the Shinobi World, equipped with a Scientific System. From that moment, he delved into scientific research far ahead of its time.

[You have become the master of the Warden Mansion.][Your first quest is to refine mana from one of your maids by having intercourse with her.]When nineteen-year-old Jett Talon suddenly wakes on an emperor-sized bed, he finds himself lord of a mysterious mansion where countless gorgeous maids stand ready to serve. His first companion is Mia, a blonde elven maid who checks his every box. After making love to her, Jett gains mana, unlocks legendary powers, learns his duties as Master of the Warden Mansion, and uncovers its hidden secrets.

Karl Adelheit, a self-proclaimed ordinary student returning from military service.

And a nobleman who enlisted as a soldier and received Medals of Honor.

Arlan can go back in time by one minute, once per day.And every time he levels up, he can go back a little further.But, even with his growing power, Arlan has never been in more danger. Demon magic was never supposed to make its way into the hands of humans, and its original owners would go to any lengths to take it back.What to Expect:-Numbers. This is a LitRPG written by someone who loves LitRPGs. It won’t be overwhelming or confusing, but if you dislike the genre, this probably isn’t the story for you. Blue boxes ahead!-Meaningful progression. Characters are always working to grow more powerful, but doing so is difficult. Level-ups are hard-earned and bring with them meaningful change in characters’ abilities.-Tactical combat. Fighting is as much a battle of wits as it is a battle of muscle, after all.-No harems.