Seraph of the End: A Rift in Time and Space

[Transmigration, System, romance.] Big Sister, I used to have an older sister, but I can't remember her name. This is a journey through different worlds in search of my sister.

In the first world, I witnessed the Western gods who stood tall in the age of myth. It was a battle between gods: Zeus of Greece and Odin of the Norse. This was the so-called Twilight of the Gods.

In the second world, I arrived at a dazzling school. That world had terrifyingly powerful conglomerates, and everyone raced against time and the future as a grand romantic comedy unfolded at a school controlled by those conglomerates.

In the third world, I arrived in an unfamiliar city. I made new friends and formed new bonds there. The battles between people with supernatural abilities and the dark forces lurking deep within the city were about to be revealed.

In the fourth world, I returned to the world I once knew, now ruled by extraterrestrial beings. The peace we had long enjoyed was about to end, and the war between vampires and humans was beginning again. Was this still the Progenitor's plan?