Demonic Dragon: Harem System - Chapter 50: Assassins Everyone die.

Nicholas Crowley is used to scraping by in a world where magic is dying. The modern age has left the arcane behind, and the few remaining practitioners fight over scraps like starving dogs. That, however, is no longer his problem. While performing a ritual, something interferes, and his soul is ripped from his body. He awakens during the Class ceremony as Nick, a kid living on the frontier of the Green Ocean, a seemingly infinite expanse of trees brimming with rare ingredients and powerful creatures. Mana is abundant here, and the omnipresent System allows for feats he had once thought impossible. And yet, not everything is as rosy as it seems. Legends walk the land, and Gods require their due. Will his experience as an Occultist be enough to navigate this wild new world?

How do I know that a goddess wrote that awful harem novel? don't blame me if i give a bad review!Inuzuka Kai thought criticizing a cheesy harem novel was the worst thing he’d do all day—until the goddess who wrote it appears, furious, and traps him inside her cringe-worthy world. Now, he’s forced to live out every cheesy romance trope he can’t stand. Can Kai survive the world’s most over-the-top love story? Or will he end up stuck as the punchline of the worst plot ever created?

A tree of 10,000 flowers, the world is the door.
The spells change a lot, but the hearts of the people are unchanged.

- Description from Uukanshu translation

One day I got a younger sister.Only I know her true identity.