Monster Harem In The Tower - Chapter 164: Dusty Chronicles: Memory Arc

Reborn into the world of Yugioh, it's natural if my goal is to become the best duelist!

As the Evil Deity of the Earth, the Ruler of the Wasteland, and the Mother of Desolation, Bai Lianyue now finds herself utterly bewildered, pinned down on a bed. Over a decade ago, in a moment of carelessness, she inadvertently ended the life of the Daughter of the Gods. Wracked with guilt, Bai Lianyue took it upon herself to raise the three children the divine daughter had left behind. Her original plan was simple: wait for the children to grow up and…

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