Naruto: Reincarnated as Sasuke Uchiha with Perfect Talents. - Chapter 7: Ninja Techniques Laboratory

Cassian Ven Dyke, the bastard son of a powerful ducal family, grew up in the slums of Veldora under the care of his father figure, sword master Russel. When Russel passed away, Cassian was left with only a silver necklace as his inheritance. After putting it on, Cassian was attacked by three psychotic thugs who tortured him in an attempt to steal the necklace. Refusing to give in, Cassian was ultimately stabbed through the heart with the very same necklace. Instead of dying, he mysteriously vanished as the necklace lodged itself in his heart. Just before disappearing, he heard an eerie message echo in his mind:[True mana detected. Origin: Human...][Human detected. Compatibility with system: Confirmed.]

The tale of Oliver.
An orphan boy from a Mine, in 19th century Europe, filled with Magic.

At the moment when he was about to be buried alive by the villagers, he blew himself up… no, he saved himself successfully.

He just wants to live and die in this era, but… that woman is too crazy.

…

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- Description from novelbuddy

A story about a weak, small larva with a human soul, who travels all the way to become the ruler of the stars.