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The fifth season of FLCL, and sequel to FLCL: Grunge.

The fourth season of FLCL, and sequel to FLCL Alternative.

In the new season of FLCL, many years have passed since Naota and Haruhara Haruko shared their adventure together. Meanwhile, the war between the two entities known as Medical Mechanica and Fraternity rages across the galaxy. Enter Hidomi, a young teenaged girl who believes there is nothing amazing to expect from her average life, until one day when a new teacher named Haruko arrives at her school. Soon enough, Medical Mechanica is attacking her town and Hidomi discovers a secret within her that could save everyone, a secret that only Haruko can unlock. But why did Haruko return to Earth? What happened to her Rickenbacker 4001 she left with Naota? And where did the human-type robot "Canti" go?

While the two six-episode installments were previously slated for late 2017 to early 2018, the staff announced at the panel that they are both slated for 2018 with a break in the middle. The two seasons will have completely separate stories. The staff previously announced that the 12 episodes will be a sequel to the 2000-2001 original video anime.

Nothing interesting happens in Naota's life since his brother left for America, leaving him with his grandfather and father in their boring little town. On his way home with Mamimi—his brother's ex-girlfriend—a pink-haired, crazy woman riding a Vespa named Haruko suddenly slams into him, kisses him, and then bashes him in the head with her guitar before riding off. The next thing he knows, the crazy girl is working as his housekeeper, two robots sprout from his forehead to do battle, and the surviving one starts living with him as well. I think it's fair to say that Naota has parted ways with his old mundane life. FLCL is a kooky coming-of-age story with surprisingly deep undertones as the twelve-year-old Naota develops through the wild antics of Haruko and matures along the way into adulthood.