Arifureta Shokugyou de Sekai Saikyou (WN) - SS Ia! Ia!

When the last alien on the world was bound to a stupid but cute world-saving system thinking he was a human:

A resource depleted world:

Alien: “I can help them deplete 5% of the world’s population in the short term, this way, this planet can continue to survive.

System 2d14 was frightened to tears: “No, don’t! Lord host!”

One day:

System 099 was shocked: [Lord host, the record you set for completing one’s first world has been br-broken by a rookie!]

Big boss Huo Li raised an eyebrow in intrigue: [Oh? Who was it?]

A certain alien happily thought that he was invincible among all carbon based life-forms! Until…… he met a powerful psychic ability user!

A horrified alien: “Hey! Why can’t I control myself?”

Powerful psychic controller gong x ultimate evolution of carbon-based organisms shou

Loyal dog with a strong sense of responsibility gong x always pretending to be human black belly shou

In the beginning there is a love-hate relationship and mutual dissing, later there is a pair of husbands cooperating to fight monsters~

- Description from Novelupdates

Side story of Kyoukai Senjou no Horizon bundled with the first press release of the 1st, 3rd, 5th and 7th Blu-ray volumes of both seasons of anime.

This side story follows Asama, Kimi and Mitotsudaira aboard Musashi one year before the beginning of the main story, as Asama is considering to create a music band together with her two friends for the next festival in Aki, a territory under the governance of K.P.A. Italia.

Leo Lock, a reading addict with the ability to truly 'read' books, never really fit in his boring 'normal' world. However, everything changed when an unknown voice found its way to his head!

Fainting only to find himself in the body of a character from a fantasy novel he once read upon waking up, Leo barely processed his new reality before he was thrown into another whirlpool.

[Role: Reader]
[Target: Reach the Epilogue.]

The only lead he had about his 'transmigration' didn’t speak much! Even the character he took over already had a foot in the coffin! How was he supposed to survive that long? Why did he have to become the protagonist’s brother?!

Moreover, what was this Personal Book supposed to be? Reading Attributes? Points?

Follow Leo as he experiences the true life of a reader in a fantasy book, facing expected challenges, and encountering all kinds of 'new'…

Would he manage to go back and find out the reason behind his 'transmigration'? Was that even his purpose? Or was this nothing but the start of a much bigger change beyond the scope of his understanding…?

***

First Volume: The Sword Master’s Second Life
Second Volume: Murim Supremacy

Note: Yes, Leo starts out with a sword, but that isn’t the limit to his choice of weapons!