The Second Europa War is being fought between Gallia and the East Europan Imperial Alliance, and a penal military unit known as the Nameless is on the run from both superpowers. Deemed rebels by Gallia and also a priority target of the Empire, the Nameless struggle to find their place in the raging war. To make matters worse, the company's tank driver, Gusurg, abandons them to fight for the Empire. After liberating a small town from the Empire, the Nameless come across Isara Welkin, an injured tank driver from Gallia's Squad 7. Isara explains to the Nameless' leader, Kurt Irving, that her squad is retreating from a failed raid and pleads for the Nameless to save them. They now face a difficult decision: remain in hiding, or redeem themselves only to aid the nation that marked them as traitors.

is an original short inspired from the song of the same name by Kiyoe Yoshioka (of Ikimono-gakari). The song is Yoshioka's first solo single. The short is directed by Keita Nagahara, and animated by the studio Enishiya Inc. The anime's story centers on a singer-songwriter, Nazuna, who is about to stop chasing her dream, and a very shy girl, Yuna. They meet and influence each other to create their own future.

A special episode aired after ep. 490, it summarizes the history of confrontation with the black organization.

At the time of the ceremony of entry to the college, a young boy named Ushino Hayama finds Sara a girl whom he met ten years ago. From this day, a change has taken place in him, and notices that can now control some water. After having succeeded the swimming championships, he discovers deep sea diving.