In the aftermath of the most devastating conflict mankind had ever experienced, the tiny island of Shikotan became part of the Sakhalin Oblast... and on the unhealed border in this remote corner of the world, friendship among children from two different countries timidly blossomed, striving to overcome language barriers and the waves of history. Inspired by true events. On August 15th, they told us we had lost the war. At that time, we did not really understand. Then one day, everything changed. Many soldiers, wearing uniforms we had never seen before, arrived on the island. That was the day I met Tanya. (Source: Production I.G)

Specials included with Girls & Panzer: Saishuushou Part 3 Blu-ray and DVD.

Two years have passed following the Tendoshuu's invasion of the O-Edo Central Terminal. Since then, the Yorozuya have gone their separate ways. Foreseeing Utsuro's return, Gintoki Sakata begins surveying Earth's ley lines for traces of the other man's Altana. After an encounter with the remnants of the Tendoshuu—who continue to press on in search of immortality—Gintoki returns to Edo. Later, the regrouped Shinsengumi and Yorozuya begin an attack on the occupied Central Terminal. With the Altana harvested by the wreckage of the Tendoshuu's ship in danger of detonating, the Yorozuya and their allies fight their enemies while the safety of Edo—and the rest of the world—hangs in the balance. Fulfilling the wishes of their teacher, Shouyou Yoshida's former students unite and relive their pasts one final time in an attempt to save their futures.

Bundled with limited edition of the 58th Gintama manga volume. The tagline for the bundled anime reads, It's time for all the Yorozuya members ...to wake up just one more time. (Source: MAL News, edited)