Zegapain(2006)

Zegapain is a sci-fi anime series that blurs the line between two conflicting realities for protagonist Kyo Sogoru. By day, he's an introverted swim club member at Maihama High School, struggling to connect with his peers. By night—or so it seems—he pilots a giant mecha in a war-torn world fighting an alien invasion. As Kyo's memories fracture and contradict each other, he's forced to question which existence is genuine and which is an elaborate illusion. The series weaves together high school drama, mecha action, and existential mystery as Kyo uncovers the disturbing truth about his fractured consciousness. With its blend of intimate character moments and large-scale sci-fi spectacle, Zegapain explores themes of identity and reality in ways that keep viewers guessing until the final revelation.