A Hentai System in the World of Danmachi - Chapter 9 - 8 - Battles inside the tower. Experience points.

On the day Zhou Bai officially became a landlady, a mysterious game descended!She exchanged several buildings in the city for a mysterious reward.After the game officially started, her reward arrived!Result... Transported to another world, surrounded by monsters, starting with a shabby little house.Territory??? Is that all???To survive, Zhou Bai could only diligently work on construction.Before long, she turned her territory into one of the top cities and continued to be the 'landlady' of another world.Elves, dwarfs, orcs, goblins... all became her 'tenants'.

Zane was just a working-class adult with a passion for one thing—Cursed Bloodline Online, the once-revolutionary game that had faded into obscurity. After six long years of grinding, he was finally on the verge of ascension—until everything changed.His bloodline suddenly reset.The world itself changed immediately after.And without warning, everyone between the ages of sixteen to thirty vanished—pulled into the game’s world.Now trapped in the Realm of Bloodlines, Zane finds himself different from the others. While most awaken standard paths to power, he inherits a hidden Bloodline Class—the Cursed Bloodline of the Vampire Progenitor, the same bloodline that mysteriously appeared on his account just moments before the transfer.Alone, hunted, and feared as one of the last of a forgotten, despised race, Zane must fight to survive. To grow stronger before the world turns on him. To uncover the secrets of his cursed identity. And to discover what force brought them all into this deadly game.Slowly but surely, he forgets himself from the past, overtaken by the life of the body he now inhabits and the mysteries that surround it, becoming the very thing that caused the gods to curse his race in the first place.

While the demons were rising, mankind was about to become extinct. Six temples rose and protected the last territory of mankind.

A young boy joins the temple as a knight to save his mother. During his journey full of miracles and tricks in the world where temples and demons are antagonistic to each other, will he be able to ascend to the strongest knight and inherit the sealed divine throne?

- Description from novelupdates

After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?

Having the capability to destroy humans, elementals, and gods, after a long period of countless wars and strife, Arnos the demon lord became sick and tired of all that and longed for a peaceful world, so he decided to reincarnate to the future.

However, what awaited him after his reincarnation is a world too used to peace that his descendants became too weak due to a huge weakening in magical powers.

Arnos enrolled in the Maou Academy established to find any students that might be the demon lord’s reincarnation, but his powers are too extraordinary that those in the academy couldn’t properly judge his powers, so he’s regarded as an “Inept student”. Being underestimated and avoided by most people there, he recruited a girl friendly to him, Misha, as his subordinate and comrade, and strives to climb to the top of the demon race hierarchy to one day reclaim his former title and status.