Gintama. Shirogane no Tamashii-hen - Kouhan-sen - episode 1 - 08 Jul, 2018

Overall episode #354 The history of Kiheitai is revealed. While the Yato on Earth try to undo Gengai's nanomachines, Kiheitai joins Katsura, Sakamoto and Nobunobu on the enemy ship, Heavenly Bird, in space. (Source: Wikipedia)