Shin Megami Tensei: Devil Children - Kuro no Sho

One day when a devilizer was sent to the main character "Kai Setsuna", he was attacked by Jack Frost with his younger brother "Nagahisa". Setsuna uses a devilizer to summon Cerberus's cool and escapes the crisis, but her younger brother "Nagahisa" is taken away by the demon world. A mysterious boy "Takajo Zet" who suddenly appeared in front of the moment taught him that he had to explore all the worlds of the demon world in order to rescue Nagahisa, and he left for the demon world. The player becomes the main character and develops an adventure. The hero calls the devil who became a demon (Nakama) by various encounters and fights against the enemy. Incidents, mysteries, encounters that block the player's path ... What is the fate of the hero? ??