World's Richest Man: I Leaped Across Time - Chapter 73: Overture

However, he did not know that he was not raising just a harmless pet, but a biological weapon secretly made by the government… a real monster.

As a former librarian, Rand felt that he had been living an ordinary life, the one that he had reclaimed unconsciously every single day.

Recently, he has been a little upset because the pet fish he accidently brought home to raised seems to have undergo some strange changes

Well, it turned into a merman.

- Description from Novelupdates

This is an alternate history. Decades after the fall of the Eastern Jin Dynasty, the world is still in chaos, although there is hope for reunification.

Shan He wakes up and realizes that he has become a gin in the world of Conan!
Use this identity to tease Conan and deceive the BOSS.
Start his wicked life!

Content Labels: Original Towards Young Man Inspirational Life Rebirth
Search keywords: Protagonist: Shan Heqing (gin) ┃ Supporting roles: Edogawa Conan, Maurilan, Belmod, Vodka, Kudo Yusaku ┃ Others: Conan, bad taste, gin, sweet

- Description from novelbuddy

“Come not between the Dragon and his Wrath.” — William Shakespeare The year was 2140, and Earth was nothing but a distant memory. Humanity now drifted through the galaxies aboard colossal ARKs, massive skyships that served as the last bastions of civilization. Yet, these ARKs were more than just floating cities; they were humanity’s last containers, preserving what remained of their species. A century before Earth’s final collapse, humanity discovered a gateway to a realm known as Eternia — a fantastical world straight out of myth and legend. Reaching this realm required more than just advanced technology; it demanded a complete departure from the physical body and entry into a mysterious process known as the Dream Weave. In the present day, Cloud lived aboard ARK NO. 427, where he had been training from a young age to step into the Dream Weave. He was a standout among his peers, excelling in every tasks that came his way. Everything seemed to be on track for him — until the pivotal day of the Class Selection process.