Futuristic Edo is no longer fun for a samurai, especially when the streets are filled with arrogant alien beings. Wielding a wooden bokken, Gintoki refuses to be moved by the invaders and will do whatever it takes to make a quick buck. The unlikely silver-haired hero is late with his rent, as usual, and his rush to avoid his landlady leads him to the sakura blossoms in the park. However, his flower watching and a delightful picnic tus into a violent game of Jan-ken-pon against the Shinsengumi! Can Kagura beat the champion Sougo as Gin tries to out-drink Hijikata, or will rebellious Zura’s giant mecha appearance put an end to all of their fun?