Episodes 5.5 and 13.

Goldran follows the adventures of three young boys who are tasked with finding alien robot fighters, or Braves, that are sleeping in the form of crystals. Their major antagonist is the flamboyant and thoroughly incompetent Walter, and the villains that follow him are often similarly humorous. (Source: Wikipedia)

The series will depict college students as they prepare and participate in a RoboMasters tournament.

Kanon spin-off OVA bundled with vol. 22 of the Kami nomi zo Shiru Sekai manga.