My Elf System - Chapter 25 - . Royal Banquet [2] -- Master Is Lying.

The starry sky was resplendent, filled with tens of thousands of Tribes!

During the Great War of the Immortal World, when the race of the God Realm was annihilated by the sixteen Immortals’ Alliance, one of their clansmen accidentally fell into a Purgatory of three thousand years under the Immortal World, lucky enough to survive …

A few years later, in a mysterious hidden family in the Purgatory World, a crippled youth who had been abandoned by his family had accidentally awakened a dragon vein …

- Description from novelupdates

Leon transmigrated and became a lab rat for Hydra. But he ended up awakening the sign-in system.[Ding, sign-in reward: Glint-Glint Fruit(Pika Pika no Mi).]He starts by destroying the Hydra Base.He accumulated some time and got himself another reward![Ding! Get the sign-in reward: Sun Breathing Technique.]

Leon Cromwell was hit by a truck and died. He thought he would never open his eyes again, but when he did, it was not what he expected.

“What? Black bones?! What's going on? Where am I?!”

He had been reincarnated into a world of magic and war! With his new situation, Leon had to find a way to get strong quickly and be able to hold his ground against the countless enemies that will come his way!

Follow the black skeleton, Leon, as he explores this new world, makes friends, finds love, and gets down to the bottom of his sudden death.

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.