"Five hundred? That's still young for an elf."

After spending five centuries fighting through another world and defeating its Demon King, Esdel finally returns home, looking forward to the peaceful retirement she earned long ago.

Instead, Earth now has dungeons, Awakeners, and a monthly rent that stubbornly refuses to pay itself.

Reluctantly climbing the Tower for spending money, the ancient elf discovers that centuries of magical knowledge make modern alchemy look primitive. Between accidentally reshaping the world's magical industry and making increasingly questionable investment decisions, retirement turns out to be far busier than saving another world ever was.