The Demon Lord's Daughter: Demona

The "Demon King," once sealed away, has returned to a world that had known peace. Unable to feel pain, the Demon King's clan is cold-hearted and ruthless. They are expanding their forces across the land, intent on wiping out humanity. Under the Demon King's command, his daughters are establishing strongholds in various regions, gathering strength for the coming war. Now, you must rise up. Drive back the goblins and uncover the Demon King's whereabouts. Capture the Demon King and crush his ambitions—once and for all!

Alice, the current Demon Lord of the Demon Realm has heard that a hero is coming to kill her! What will she do? Well, she'll go to him, of course! And anyone who opposes her on the way will be drained to add to her power! Nothing will stop her; be they goddess or titan!

You, a descendant of a hero and a skilled swordsman, have received a request from the kingdom to embark on a journey to defeat the Demon King.
Leaving your lover, Maya, back in your hometown, you set off on your journey.
After a long journey and a fierce battle, you defeat the Demon King, but with the last of his strength, the Demon King places a mysterious curse on you…
What exactly is the curse that has been placed on you…?
 

After getting hit by “that truck,” you reincarnate into another world…!!
You’re not a hero or a sage — you’re reincarnated as the Demon Lord!
In a world inhabited by humans, demons, elves, beastfolk, and oni,you must forge bonds with each of these races…using your magical penis!

On that day, an adventurer reached the end of his life.
Under a clear blue sky, struck by a bolt of lightning.
And so, the young man Alto sets foot in the land of “Purgatory.”
The first person he meets in Purgatory, a world of demons, is… a lonely Demon Lord who has just awakened from a thousand-year slumber!?
A Purgatory life for the Demon Lord and Alto begins on Hard Mode.
Their enemies: every single demon in Purgatory. On the other hand, they don’t even have a place to live.
However, Alto has a trump card up his sleeve.
It is a secret art passed down through his clan to construct a “Demon Tower.”
If they use this as their base, they can at least secure a minimal standard of living—
Wait, WHAT!? We’re going to use this Demon Tower to go beyond the surface world and reach the heavens!?
Just how many stories high is this thing gonna be!? Don’t be ridiculous!
And so, this absurd tale begins!