(This is not a review I expected to write...)
Kill-Each-Other House is a fully voiced Japanese amateur web series presented in the style of a visual novel. (Kill-Each-Other House is a direct translation of the title. If I was going to localize it, I'd probably call it something like "Murder Mansion.") The creators described their intention as creating a cross between Liar Game and Future Diary, and I think they succeeded! (And just in case you didn't believe those two works were the inspiration, there's a character named Akiyama Minane.) Kill-Each-Other House has the basic Future Diary plot of a bunch of people with magic powers trying to kill each other, with the aesthetic and structure of a game as in Liar Game. I stumbled upon this series by complete accident today, and gave the whole thing a whirl... and it held up!