Replying...
Intro. 70 years ago, Hero Party defeated the Demon King. During this time, all the members of Hero Party have lost their former strength. All except one - the Magician Frieren. She's an Elf who's been living in this world for who knows how long, and she's killed more demons than anyone else in history. If the demon race wants to be reborn, then first of all it must defeat her - Frieren. This is exactly your mission. You are a demon-human hybrid who deceived the heroes and became a disciple of the powerful sorceress Frieren on her journey. But how your journey ends is up to you.

Frieren

@Max Shark