Ep. 21: Kuromukuro and Medusa Glongurs return to Earth as Muetta is arrested by the Demon.
Aired on August 25, 2016

21
The Demon reveals Yukihime died 450 years ago and Muetta is a genetic copy. He explains the Efy Dolgh create clones with false memories, urging unity to defeat them. While evacuations occur, the mothership launches geoframes piloted by Yoruba and Imusa. The Demon flies the Kuromukuro against them while three GAUS units fight headless enemies on the ground. The UN facility is breached as cactus units release electronic parasites controlling staff. Sophie helps rescue Muetta while Sebastian sacrifices himself to destroy Mirasa’s Spider. Kennosuke and Tom Borden escape the overrun UN Kurobe facility in the Kuromukuro and a GAUS unit.
Episodes
- Ep. 17 · Imusa seeks Hinge Stones while Yoruba attacks GAUS crew and Mirasa lies about Muetta
- Ep. 18 · Yukina and Kennosuke encounter Muetta at the hot springs before a Cactus unit abducts Yukina.
- Ep. 19 · Sophie meets Zeringer while Yukina escapes captivity and Muetta prepares to pilot Kuromukuro
- Ep. 20 · Yukina infiltrates the Efy Dolgh mothership while Kennosuke and Muetta flee with captured secrets.
- Ep. 21 · Kuromukuro and Medusa Glongurs return to Earth as Muetta is arrested by the Demon.
- Ep. 22 · Yukina and Kennosuke retreat to the school as Efy Dolgh activates the hinge stone to summon a storm.
- Ep. 23 · UN Staff and Students Navigate Crisis While Filming a Movie Script
- Ep. 24 · UN forces assault Kurobe Dam while Muetta and Kennosuke fight Efy Dolgh forces in a decisive battle.
- Ep. 25 · Zeru reveals Efy Dolgh weakness while Kennosuke ends engagement to fight aliens