In a world where the celestial diary of a girl holds the secrets of the universe, a young archivist must unravel its mysteries to save her own life and the fate of the cosmos....

In a world where secrets are currency and danger lurks in the shadows, a young girl discovers she is the key to a guardian's destiny, leading her on a perilous quest to unveil the truth behind her family's past and her own mysterious powers....

Two students from the Boys' High School Girls' Historical Quest team uncover a mysterious time-travel device, leading them on a heart-stopping journey to meet their ancestors and solve a long-lost family secret....