My Uncle Came Back from Another World

★The blurb has been revised

After reaching max level in another world, Kamishiro Kazuma could finally go home.

Kamishiro Kazuma, smugly: The person standing before you now is Kamishiro Kazuma, the [Traitor to His Family], the [Outlaw of the Galaxy], the [Murderer of Nothingness], the [Gravedigger of the Voracious Beast], and a man with a 99.9-billion-bounty from the company!

The good news: His identity hadn't been erased. A man who had been in a coma for twenty years waking up again was a medical miracle.

The bad news: After twenty years, everything had changed. Earth had sped straight into an era where Ultraman and robots teamed up to fight monsters.

To help him fit into modern society as quickly as possible, his older sister packed him off to live with her young nephew, who supposedly had a respectable job in Tokyo.

·

Natsukawa Haruki's fate took a turn twice.

The first time was when he became Ultraman Z's human host. The second was when Kamishiro Kazuma, who claimed to be his "uncle," showed up at his door with a letter from his mother, asking to be taken in.

Natsukawa Haruki: Osss!

As they spent time together, Natsukawa Haruki realized that his uncle seemed to be suffering from a serious mental illness.

His uncle insisted that the twenty years he had been asleep were actually spent after he transmigrated to another world, where he beat up bullies and trounced armies, and had a bounty of tens of billions placed on his head by an organization called the "Interastral Peace Corporation."

Haruki: I don't understand, but I respect it.

Natsukawa Haruki carefully looked after his "sick uncle." He sent him to night school, introduced him to his friends at STORAGE, and even gave his uncle his salary card to hold on to.

Until

One day, a monster went on a rampage, and poor Kamishiro Kazuma was caught up in it.

Just as Haruki was about to transform into Ultraman Z and save him, his uncle casually picked up the knife he'd been using to cut fruit and made one effortless slash. The "king of the waters," the monster Eleking, instantly became Eleking sashimi.

Ultraman Z: Osss! Are humans really this amazing?!

Natsukawa Haruki: O...sss? Wait, Z-san, don't get weird ideas about humans! Uncle Kazuma is definitely cheating!

[How to Enjoy This Story]

1. It's the uncle-from-another-world trope. The original is really fun, highly recommended!

2. The main world is Ultraman Z, and the other world Kamishiro Kazuma transmigrated to is Honkai: Star Rail. You can enjoy the story even if you haven't played the game. The author's research is based on information available before Honkai: Star Rail version 2.2, while Kazuma transmigrated before the game's launch.

3. He transmigrated during his chuuni phase. Kazuma is a handsome baby-faced guy!

4. The blurb was archived on 2026/4/3.

Thesis: Looking after your loved ones is everyone's responsibility.