Screw it, this 'end of the world' is so vague I'm interpreting this my way.
This is Splatoon 3: Majora's Mask. Dawn of the final day: the moon is crashing onto the earth in 24 hours. I'm going with save the day. We need to beat all four temples to awaken the giants that will catch the moon or whatever (I have never played majora's mask), and we could use all the help we can get