Jinwoo continues to progress rapidly through the Demon's 6 Castle, climbing toward the top floor with the help of a demon noble who has agreed to escort the intruder if it means not having to fight him herself! Preoccupied with his personal quest, Jinwoo is unaware of the escalating threat outside the dungeon. The ant magic beasts that laid waste to Jeju Island are looking to relocate, and if they reach the mainland, all of Korea could fall. Will the combined S-ranks of Japan and Korea be enough to quell the swarm-and will Jinwoo be joining them?!

With Esil the demon noble's guidance and his shadow army by his side, Jinwoo's making his way up the floors of the Demon Castle at a breakneck pace. At this rate, it won't be long before he reaches the top floor to face Balan the Demon Monarch. Meanwhile, on the other side of the gate, an unexpected and most unwelcome magic beast is spotted on the shores of Japan...