TouchGen writes: "To get to know more I took a look at the webpage for Hyakki Yagyo, and got the following addition to the description:
"In the rule of this game, you won't die even if you recieved enemy's attack.(However, the energy of the magic circle and power to attack decrease.)You should defeat the boss in each stage until the time limit. If the boss run away three times, Game is over. (When the stage boss can run away even once, it is game over.)"