How do you defeat Naraku in the video game Inuyasha and the secret of the cursed mask on your second battle with Naraku also when his Hp is only question marks

Just keep hitting him. Use Co-ops as much as you can, unless youre with Sesshoumaru, in which case Im not sure. It wont tell you his health at any point in the fight, so just keep at it. Just when youre about to give up, he might be nearly defeated.

according to the internet he has 10,000 health points