DxD: Shadow Monarch - Chapter 22: Xp Way Stone

Once through the pirates, Lu En became the son of Monkey d Dragon, a grandfather named Monkey d Karp, and an unreliable and neurotic younger brother named Luffy.

Fortunately, the ghost back system is activated!

The completion of the ghost back is 10%, and the training effect is increased by 100 times!

The completion of the ghost back is 20%, and the training effect is increased by 1000 times!

…

One day, Lu En, a ghost-backed master, appeared in front of Luffy who was shouting to go to sea, and made Luffy cry on the spot.

Luffy: “The pirates in the sea are all monsters like my brother? I don’t want to go out to sea!”

Garp: “For a long time, the two boys, Long and Luffy, with small arms and calves, I really doubt that they are not my sons and grandsons. Like Lu En, they are the grandsons of the old man!”

Warring States: “The strongest creature in the sea, land and air is Kaido? No, it’s Lu En!”

- Description from novelbuddy

Vergil, a 21-year-old young man, leads an apparently simple life in a somewhat troubled world. His family is also simple—although his father is no longer alive, his mother has always been by his side, despite being a bit... aggressive. But that's not so unusual nowadays, right?Everything changes drastically when Vergil, after an unexpected death, awakens as a demon. To his surprise, he discovers that he has accidentally married beautiful Pure-Blood demonesses.Now, he will discover how the world really works from a Demon's perspective.

[You have signed in!][Lucky spin in effect!][You have obtained (Immortal Body)!]---Rion was a teenage boy who, unfortunately, had never seen the world beyond his own.Born with a weak body and a mind too great for it, never allowed a single moment of peace; he always dreamt of the outside world, of the great nature.His doctor had told him that he would be going out soon... but he didn't think he meant he would be outside like this.Rion had died that day, only to be reincarnated in a tribe of Warriors. But this time his life would be different as he was accompanied by his cheats. Rion had decided to live a simple life—[Ding!][You have signed in at The Spring of Youth!][You have obtained the passive skill (Minor Heal)!][Ding!][Lucky Spin is in effect!][Congratulations! You have obtained 100x reward!][You have obtained the passive skill (Immortal Body)!]—Until he obtained Immortality.He had never cared about the rewards he obtained from his sign-in system and lucky spin; he was happy with anything—everything, but... Now he could travel the world without fearing what he feared the most—death. He had gained Immortality, after all.____Stakes would be low. Mostly Slice of Life with tidbits of action and drama.

The two faced number one female spy transmigrates to a different world and becomes an outrageous idiot girl. When she woke up, what she had to face was consecutive blows of the decline of her family clan, her crippled martial skills, and her disfiguration. To protect her family, she must obtain the treasured book, obtain outstanding achievements, summon a dark beast army. Wait and see how in this unfamiliar, dark magical continent, she dies and becomes a demon then steps up to the top, making all of the formidable people in the world bow down to her in respect.

- Description from Novelupdates