https://www.pixiv.net/users/15752229

Artist: The city was invaded by the darkness forces, demons are harming people's life. 3 girls are chosen to become the pretty cure because of their unique body characteristics and they use their power to protect the city.
Only beating down the demons is not enough to lift the threat from people, a special 'purification' was needed for the demons in order to prevent their regeneration and free their soul.

P.S. Seems the general of demon had got something interesting after the fight...