I Became Friends with the Second Cutest Girl in My Class (WN) - Chapter 4: Chapter 4 – Keeping Secret

After causing a tech disaster in the real world, genius shut-in Rin Katsuro is sentenced by the gods and banished to Ereborn—a realm ruled by chaos, where ancient scripts control magic and dungeons feed on trauma.He wakes up in the body of a legendary war criminal—the Demon King's General—and is mistaken for the adoptive father of a demon princess.Armed with unstable “Error Magic” that lets him rewrite reality like code, Rin doesn’t want to be a hero... but when angels declare war on the demon races, and his daughter calls him “Papa,” he might just rewrite fate itself.This is the story of a broken man with nothing left to live for—until an entire world starts calling him Dad, Demon, and Destiny.

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

Sylas Gray returns to his hometown in the countryside for a winter vacation to his ancestral home, only to find himself caught in the midst of an apocalyptic outbreak. The world descends into chaos as the undead overrun everything, and the small town he grew up in is no exception.With hope dwindling and death lurking around every corner, Sylas witnesses unspeakable horrors—brutal killings, betrayals, and the darker side of human nature. Yet, amidst the despair, Sylas refuses to give up. Determined to escape the town and reach the capital, he is thrust into a shocking revelation.A mysterious change occurs within him, granting Sylas the ability to sense and control space. He discovers that he possesses a pocket of space within his own body—a power that could be his key to survival.Follow Sylas as he embarks on a perilous journey, fighting to survive, uncovering the truth behind the apocalypse, and discovering the true potential of his newfound abilities.

I’ve become the ultimate crafting all-master character in a game world, excelling at everything except combat.And now, I am the only one who can save this Northern Grand Duchy.