The Reborn Otaku's Code of Practice for the Apocalypse - Chapter 13

The two faced number one female spy transmigrates to a different world and becomes an outrageous idiot girl. When she woke up, what she had to face was consecutive blows of the decline of her family clan, her crippled martial skills, and her disfiguration. To protect her family, she must obtain the treasured book, obtain outstanding achievements, summon a dark beast army. Wait and see how in this unfamiliar, dark magical continent, she dies and becomes a demon then steps up to the top, making all of the formidable people in the world bow down to her in respect.

- Description from Novelupdates

Human civilization expanded into space, and its territory spanned across galaxies.

During this great trend of interstellar migration, Zhou Qing accidentally awakened the power of traveling to various Astral Realms. He was able to create [Astral Realm Apostles] as vessels for his soul and project them onto different realms. This allowed him to travel through various worlds with different identities.

His unremarkable life was met with an unexpected twist of fate. Every time he created a new Apostle, it was like being reborn.

Yet, slowly, he realized that the Human civilization wasn’t completely ignorant about the existence of other realms…

——

Multiple-dimensional worlds, multi-dimensional factions. This is an clash of fate between realms!

And he is the only being who is able to travel amongst the realms in countless different shapes and forms — The Astral Apostle!

When an S-class elite assassin-raised captain of a special ops suicide squad comes home from a high-stakes Africa mission, he finds himself offered something that could potentially set him up for life- a curious assignment that he could use to finally exit his days of war and slaughter.

Then placed into a high-school setting, Lin Yi is tasked by the chairman of a top-tier multi-billion company with bodyguard duty for non-other than his own daughter, a certain little Miss of said high-school.

His enemies, once ranging from drug lords, mafia bosses, political figures, and national leaders, are soon replaced with spoiled kids who happen to have rich papas and mamas, and Lin Yi finds his intense expertise and high-threat skillset misused, and very underwhelmed…

But he does get a harem cast as diverse as his old enemies, so Lin Yi decides that, for the sake of messing around with girls as an invincible entity in a down-leveled environment, leaving his bloody and death-filled war days behind is something he’d definitely want to strive for.

- Description from Novelupdates