Tsuki ha Higashi ni Hi ha Nishi ni: Operation Sanctuary(2004)

Tsuki ha Higashi ni Hi ha Nishi ni: Operation Sanctuary is an anime series following Naoki Kuzumi, a teenager haunted by a five-year-old tragedy that claimed his parents' lives. Living with his aunt, uncle, and cousin Matsuri, Naoki struggles with fragmented memories of his childhood. His ordinary existence shatters when a mysterious redheaded girl named Mikoto literally falls from the sky and insists he's her younger brother. As Naoki grapples with this impossible claim, he's drawn into a world far stranger than his quiet life with his family. The series blends mystery and drama as Naoki uncovers the truth about his past, his connection to Mikoto, and the secrets that have shaped his identity. With each revelation, the boundaries between his forgotten youth and present reality blur, forcing him to confront what really happened the day his parents died.