Seven Sleeping Beauties

I want to wake up the princess who was put to sleep by a witch's curse… but there are seven of them! So it seems that I have to kiss... seven girls! Now the princesses are awake, but the other people in the kingdom are still asleep... Why? Is there more to breaking the curse than just a kiss or am I still missing something...? Alec is the third prince of Rudbekia who wants to save the kingdom of Amaryllis and its seven princesses. In a country where only they are awake, they must work together to save everyone from the curse! (Source: Kodansha, translated)