MTL - One Piece’s Strongest Ice Dragon - Chapter 637 regret!

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

After a tear in reality pulls Kagari Shuya into a white room he discovers a futuristic interface for reincarnating in a different world. After looking through the different races and skills he unlocks a new race, Lucivault, a type of vampire with none of its characteristic weaknesses. All set to start his life in a new world, Shuya is confused to discover that he is enveloped in darkness. As it turns out something went wrong when he was transported and instead of appearing where he was supposed to, he appeared in an underground cave. Shuya faces untold dangers, runs for his life, before finding his way out of the underground world. After escaping he meets his Shishou and begins to learn to fight with a spear. There is also a cute black cat named Rollo.

Payload specialist, Tang Yue, who is a mechanical and electrical engineer by training, is left stranded on Mars when he receives news from his AI robot assistant, Old Cat, that Earth has exploded. He believes himself to be the last human in the Universe.

Good news: someone found a sheepskin that emits text when picked up.Bad news: that person is not me.Good news: the old man downstairs can see the death countdown above people's heads.Bad news: the old man is about to die.Good news: the landlord's daughter has been reborn with memories of the future.Bad news: I am still clueless.As reality becomes more bizarre, the game's situation continues to evolve.The 'Seeking Demon' game service begins, and Fang Yu enters the game, only to discover that this game does not display health bars.Yet, he is able to see them!”Big Demon King: 1/21999.“”Let go of that demon, let me handle it!“”Sky Fang Tiger: 29481/29482.““Brothers, charge! Massive blow! Whoever gets a kill, it counts as theirs!”Fang Yu retreats while shouting loudly.