Siblings of Oblivion R1: Chaos.....and Order

"Wake up! Wake up Big Brother!" Your little sister Anna wakes you up, calmly poking you in the forehead. "Big Brother! The festival is going on! Don't tell me you forgot!!!" Anna made such a fuss since she wanted to see the Crowning of the Light Keeper. The Light keeper, crowned every 100 years, defends New Earth from the terror of the Shadow Beings. What should you do? Go, or shoo Anna?