Okay i just finished watching Mirai nikki. I loved the series, though the ending got me a bit depressed (got rid of said depression after finding out the true ending in the final chapter of the manga) BUT! to get to the point. I'm rewatching through again to see if i can understand the storyline more. I'm on episode four again and theres just one thing i want to be explained to me; How did yukiteru opening that door change their futures so much.
Spoiler Well the reason Yuno went to the second world after becoming God is because she wanted to be be with Yuki again, so when the second world Yuki found the bodies of Yuno's parents, Yuno knew it would affect their relationship in that world and may even lead to the discovery of the second world Yuno's body that the first world Yuno killed (which it eventually did as well).