Elydes - Chapter 299: Musings on the Condition of Humanity

Heartbreak was the worst thing Kanata thought he’d face this week. He was wrong.When the world begins to rot and the dead rise, survival becomes the only thing that matters. Trapped in a school turned slaughterhouse, Kanata finds himself side by side with unexpected allies—his sharp-tongued childhood friend, a fierce upperclassman with a blade, and a dangerously calm teacher with a mysterious past.With betrayal still fresh and the world falling apart, Kanata isn’t looking to be a hero. He just wants to stay alive.But in the apocalypse… staying alive is the hardest part.

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

In the world of dragons and snakes, the talented but congenitally sick martial arts master was reborn as the sole heir of the 19th-century Canadian manor owner. He thought he would make money by practicing boxing, but he took advantage of the industrial revolution to become a giant of the times. The opened template.

In the end, the original owner was a hopelessly sick and consumptive ghost! I am still a bastard having an affair with a gardener…

Wait, what’s up with the claw?

James Howlett looked at the bone claws protruding from between his fingers, and became more and more worried about his future.

- Description from novelbuddy

Our straight (?) bottom woke up ten years into the future and found himself on the bed of his childhood friend… At the start, the bottom was shocked to his very bones, but he soon quickly accepted this premise and found the whole situation to be rather amusing. Precisely then, the bottom once again went back to his timeline — back to when he and the top were just platonic childhood friends.