This is just a cleaned up revised version of my previous clear.
Things to note. The first form can be done in less turns depending on how many times he dispels you. Just keep attacking with LB’s if he doesn’t dispel anyone.
The 3rd form, you can start attacking on turn 3 after the bosses mitigation wears off, but you should save Kaito’s undulating wave until you knock the boss down to about 60%, then use it before your big burst. You can finish it in about 6 turns this way. I used it too early in the video and the boss healed and it took an extra two turns. lol