First confrontation with Iron Mask

Just continuing on the story of Soul Hackers 2 a bit and we get to the fight direct confrontation against Iron Mask while trying to find Mangetsu. Milady was, as usual, pretty aggressive and tried to attack him, but no real result as this is supposedly the boss of the boss.
Seemingly the enemies have all, but one covenant so they're almost ready to end the world as we know it. How is Ringo going to solve this situation?

Last few game sessions, I was distracted going through the soul-levels for the various characters and doing merges of demon. It can get quite addictive to be honest to try and "get them all" by merging the right demons and farming cash to summon more.