Fourth season of Quanzhi Fashi.

When ordinary high school student Aoba Watase is suddenly targeted by a giant robot known as a "Valiancer," he is saved by his mysterious classmate Hina Yumihara. After revealing that she and their robotic enemy are from the future, Hina suddenly propels Aoba 70 years forward in order to prevent his death. Upon arrival, Aoba finds himself in the cockpit of a Valiancer called "Luxon," stuck in the midst of a firefight between the military forces of the Free Pact Alliance (FPA) and Zogilia Republic. After he shows high compatibility with an FPA pilot named Dio Weinberg, the two perform a successful "coupling," allowing them to share experiences and subsequently increase their capabilities and skills. Although Aoba is able to survive this unexpected battle, he is taken into custody by the FPA ship Cygnus, who wishes to interrogate him. While the student's main concern is whether he will ever be able to return home, what he doesn't realize is that he is about to get caught up in a war to protect the world. [Written by MAL Rewrite]

When Shoutarou Tatewaki first meets Sakurako Kujou, he knows his life will never be the same. Initially believing her to be responsible for a disappearance in the neighborhood, he later learns of her true talent: analyzing bone specimens. Sakurako has quite the collection of reconstructed animal bones, but she wishes she had more of the human variety, much to the chagrin of those around her. Soon, Shoutarou begins accompanying the eccentric osteologist on the many different unsolved cases she comes across—usually in the form of decomposing bodies. But with so many incidents happening around them, could there be a larger mystery at work in their lives? Sakurako-san no Ashimoto ni wa Shitai ga Umatteiru is a story of two unlikely partners, each showing in their own way that bones can tell how one died, but only people can tell how they lived. [Written by MAL Rewrite]

The story centers around a spirited high school girl named Marika. She keeps herself busy with the space yacht club and her part-time job at a high-class retro café. One day, two strangers suddenly appear and claim to be subordinates of her dead father. They demand that she assume command of the space pirate ship Bentenmaru. A privateer ship's compact was made during a war of independence a century ago, and according to that compact, the ship must be inherited by the captain's next direct descendant. Marika finds herself embarking on a new life as a space pirate.