The fourth season of FLCL, and sequel to FLCL Alternative. It centers on three teenagers who graduated and have started working. The CGI anime will have a theme of the feeling of being an adult.

A long time ago, there existed a Demon Lord who terrorized throughout the world until a Hero stepped up to the stage and challenged the Demon Lord, ultimately defeating him and ending his reign. The Hero then created Rosewood Academy, an academy made to help heroes-in-training achieve supremacy and help defend the world when needed that enrolls only the best of the best. Enter Arnest Flaming, a girl with a high sense of duty and the top student at the academy, hence receiving the alias "Empress of Flames" who one day encounters the lively, carefree new transfer student Blade, a boy who seems to equal her in power, something that she finds really irritating. Arnest was then personally requested by The King to supervise, and show Blade around the academy during his stay. The story follows the students' struggles in their quest to become heroes.

How can you fall in love when you can’t even hold hands? Due to a childhood curse, anything that the Duke touches will die—which makes his flirty maid’s behavior all the more shocking! Is there a way for the Duke and his companions to somehow break the curse, or is he doomed to a life where love is forever out of his reach?

As peace returns to the demon realm, Anos Voldigoad wishes nothing more than to put his reputation as the Demon King of Tyranny to rest and go back to being a misfit at the prestigious Demon King Academy. Unfortunately, any tranquility is fleeting: sinister demons, kings, and deities plot Anos's demise from the shadows. Rumors spread about the "Child of God," a being whose power may rival that of Anos. To uncover the truth and eliminate the potential threat, Anos must journey deep into the land of spirits. However, the spirit world is shrouded in mystery, and it may only be entered after undergoing a series of difficult trials. With unrivaled power and confidence, Anos braces himself to defeat various formidable enemies with grandiose titles. But he—with the assistance of his trusted allies—will barely have to break a sweat as the true Demon King of Tyranny.