- The Magical Girls who join this game will live together for 24 hours.
- After the game begins, no matter what, it's absolutely forbidden to laugh.
- Those who laugh will be severely punished. Their soul gems will also get a bit dirty.
- The participants may retreat from the game before it's over.
- In the end, a wish will be granted to the participant who laughed the least.
- In the end, the Soul Gem of the participant who laughed the most will become a Grief Seed.