Fate in Bleach: Unlimited Blade Works! - Chapter 149: Soi Fon’s Request

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.

A man reborn, more interested in his next meal than clan politics, finds himself caught in a power play that could reshape Konoha.Uchiha Masashi has seen it all before - literally. With memories of his past lives and abilities that shouldn't be possible, he'd rather perfect his combat skills than deal with clan drama.But when the newly appointed Fourth Hokage shows up with a proposal to unleash the Uchiha's power beyond their traditional police role, even Masashi has to pay attention. The clan sees opportunity. The village sees profit. Masashi sees the threads of fate that once led to his clan's destruction starting to weave again.As the Uchiha rush to prove themselves “ten times better than the Hyūga,” Masashi walks a fine line between duty and survival.He knows too much - about the Nine-Tails incident that could destroy his clan's reputation, about young Shisui's tragic destiny, about the wheels already in motion.The question is: will he bother trying to change any of it?After all, in a world where even the strongest must sometimes bend to fate, sometimes the smartest move is to grab some dango and watch it all unfold.

Huang Dan’s pain nerve is innately different from the ordinary people. A little tore in his skin can cause him to sweat all over his body painfully to the point of him unable to make a word out.

Somehow, he began to cross world, following Mr. System to do the tasks…

In the first world, Huang Dan realizes what it means to die painfully and to live to die again.

TL’s summary:
MC suddenly transmigrated and is bind to a system, requiring him to solve mysteries. Born with a higher degree of pain sensitivity, he met different people in the different worlds and learns what kind of emotion smiling is.

- Description from Novelupdates

High school student Mikoshiba Ryouma was summoned to a different world in the middle of a war. Sensing the malice from the one who summoned him (a summoner of the O’ltormea empire), he uses his martial arts to run away, killing important people of the empire during his escape. After the escape, he rescues two twin sisters from the hands of thieves. The sisters who can use magic, swear to serve him as subordinates. Thus, Ryouma begins his journey on the path of the supreme ruler.