Aquarion Evol (2012)

Blurb:
After accidentally forming the legendary mecha “Aquarion,” Amata finds himself at a pilot-training academy where the flirty girls love to get a rise out of him, and the boys seem more interested in exploring mysterious holes and big bangs than harnessing their Elemental superpowers. It’s all awkward dates, hijinks, and threesomes until otherworldly beings start abducting powerful female students. As a mysterious megalomaniac plots interplanetary disaster, the fate of the galaxy depends on whether or not the hormone-fueled academy coeds can come together to fight evil.

Set 12,000 years after the events of Aquarion.

Source: www.anisearch.com/anime/6926