No Game No Life - Vol 4 Chapter 1

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

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

Having opened his eyes once more, Chu Zheng found the world turned upside down. He had transformed from a Cultural Relic Restorer into a household slave.At the same time, a new feature had emerged within his body: a Repair Panel that refreshed daily, enabling his skills to continuously advance.【Incomplete Mantra (repairable)】→【Great Circulatory Breathing Guideline】【Ruined Temple Remnant (repairable)】→【Ancestral Dao Golden Body】【Damaged Spirit Root (repairable)】→【Superior Quality Immortal Bone】…………In an era of cultivating truth, heroes compete fiercely, and prodigies rise together.From ancient times, sages and wise men were buried by the sands of time; a lifetime of glory or disgrace turned to naught in a blink, and only a few names are recorded in the annals of history.Having lived this life a second time, Chu Zheng did not seek the arts of immortality, but merely wished to have his name remembered by future generations.

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.