Fifteen years ago, a gate to another world suddenly appeared in the Pacific Ocean. The other side of the world, the world of Semani, has a civilization similar to that of Earth hundreds of years ago. Now, a girl knight from that world of swords and magic and a detective from Earth form a strange combination, and the two move forward towards a common goal! The blockbuster work of the "all-gold" authors Hedong Zhaoji and Murata Renji is coming.