Toaru Majutsu no Index: Genesis Testament - Volume 4, Prologue: A Picture Book that Slipped through the Cracks – Magic_Side,Open.

A small immortal clan, with the efforts of the ancestors of the past dynasties, slowly developed into an immortal clan. This is the history of the development and growth of a small family. During this period, there were ups and downs, and there were also struggles for power and profit.

- Description from novelbuddy

Zhou Heng thought the news of an impending solar flare and natural disasters was absurd—until he died in the apocalyptic chaos that followed. Reborn ten days before the end begins, Zhou Heng now knows the truth: earthquakes, tsunamis, plagues, and even zombies will devastate the Earth.Armed with the Doomsday Sanctuary System, he has a chance to rewrite his fate, but there’s a catch—it requires a shelter to activate.With only ten days left, can Zhou Heng gather the resources, fortify his sanctuary, and prepare for the storm of humanity’s collapse?

Yuka, reborn as the daughter of the universe's richest man, tries to live a simple life. She gets a big shock when she has to join Union University of the Alliance because of government rules.In university, Yuka picks an easy major, hoping to keep a low profile. But her plan doesn't work. She keeps facing tough situations that show off her smart mind and strong skills. Yuka tries hard to live normally but keeps getting pulled into extraordinary accidents.This is the story about how Yuka grows. It's about her trying to hide her real identity while dealing with a world that always challenges her.

“Legend had it that in the deepest part of the oldest galaxy, there was a door as red as blood and fire.

Legends and myths, darkness and light, countless stories passed through this old door.

The Door of Constellation that overlooked everything would warn the sky and earth, sending darkness back to where it belonged.”