I'm finding it difficult to play this game for long periods of time, because my body starts to shake every time I get to a new area and it is legitimately exhausting. I just can't communicate how perfect this game feels. It is such a wonderful sequel to the original SMT games.
At 16 you could get hooligan and he would help too. Or you could just equip the white samurai armor from the free DLC. I feel like grinding to such high levels is really beyond the point of the game, though. I didn't get to level 16 until several hours after I passed that boss.
What level are you? If you can get to level 17, you can fuse Raiju and he'll be amazingly useful against M*****. Also get some demons with zan for that fight.
At 16 you could get hooligan and he would help too. Or you could just equip the white samurai armor from the free DLC. I feel like grinding to such high levels is really beyond the point of the game, though. I didn't get to level 16 until several hours after I passed that boss.