The mecha battles actually use tactics instead of just beam spam, and the time travel twist recontextualizes everything you thought you understood about why these pilots matter to each other. Aoba's confusion mirrors yours, which means the cryptic setup isn't a flaw, it's the point. By episode thirteen you realize the show spent thirteen episodes answering a single question: what does it cost to save someone who's already dead.
Aoba's ordinary high school existence shatters when a colossal robot crashes into the city, hunting him through crowded streets. Just as everything seems lost, his classmate Hina drops from the sky in a mecha of her own, pulling him to safety with a cryptic message: someone named Dio is waiting. That rescue opens a door Aoba can't close. He discovers he's been conscripted into the Free Treaty Alliance's war against the Great Zogiria Republic, a conflict he knew nothing about until that first attack. Now piloting his own robot, Aoba finds himself thrown into military life and high-stakes combat operations. The show blends intense action sequences with the disorientation of being dragged into someone else's war. Aoba grapples with the weight of his unexpected role while piecing together why he was targeted in the first place. Hina remains enigmatic, her connection to this larger conflict deliberately unclear. For viewers drawn to mecha stories that ground themselves in one character's confused resistance against being swept up by forces beyond his control, this delivers both robot spectacle and genuine uncertainty about what comes next.