Future Diary is an anime that has garnered a cult following and a lot of acclaim; blending action, horror, science fiction and romance more or less effortlessly. With incredibly memorable characters and bizarre twists and turns that keep the viewer's eyes glued to the screen trying to figure out just how it's all going to end.

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It can also lay claim to popularizing the 'Yandere' character trope with the much-beloved character of Yuno Gasai. However, as with any time travel story, the narrative isn't going to be perfectly constructed and nearly ten years after the anime originally aired fans are still scratching their head about some of the show's plot holes.

10 Nobody Cares About Terrorism

This comes up right near the show's beginning and seems like a pretty major oversight. The second diary holder to attack our protagonists, Ninth rigs Yuki and Yuno's entire high school with explosives. By the time the fight between the three of them is finished, most of the building is reduced to rubble and several students and teachers died in the attack. Despite this mass terror attack, the students are just relocated to a new school one month later and little else is said of the incident. In fact, Yuki's mother doesn't even mention this when she comes back home. The police arrange a manhunt for Ninth but a tragedy on that scale has much more of an impact.

9 Yuki Doesn't Know About The Death Game

All the Diary Users in Future Diary

When Yuki is first informed about the rules of the death game, it comes as a surprise to him, but not to any of the other participants; in fact, more than a handful of them seem to already be aware of and participating in the game. The Twelfth helped to design the game's rules so in his case it makes sense but why did Deus not tell them all at the same time? Or at least why did he give Yuki that kind of a disadvantage when he later claims that Yuki was always his favorite of the contestants?

8 The Ninth Never Died

Although she appears to die after she joins forces with Yuno and Yuki, the ninth diary holder is saved by Deus at the last moment. Which begs a big question: How exactly did Yuki win the game? If Deus perhaps did something to nullify her position in the game then it's never explicitly mentioned, she simply shows up later having been rescued from death.

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We know for sure that she didn't die and come back since not even god can revive those that have died. It's a major plot hole that could easily have been mended with only a line or two of added dialogue.

7 God Can't Really Do Much

Yuno Gasai yandere face

The victor of the death game comes away with what could be considered the ultimate prize. They become god. There's just one problem: God doesn't seem to be all that special. First World Yuno (The Yuno we follow for most of the series) is god, and though she hides it when her identity is finally revealed she's hardly all powerful. Yuno travels back in time, flies, throws things with her mind, and seems to have enhanced physical capabilities but that's it. God can't raise the dead, and she clearly isn't immortal since Yuki is able to kill her with a knife. In fact, Ninth who is given a fraction of Deus' power seems to have exactly the same abilities that Yuno does. So really what's the point?

6 Yuno Got Away With Murder

Fans of the anime accept a lot of the things Yuno does throughout the show based on the fact that she's god and from the future. It explains how she is as fast and strong as she is without any physical training, and it also explains how she knows many of the outcomes of her fights in advance. What it can't explain is how she got away with the murder of her parents. If Yuno's parents were just regular people then their disappearance might go unnoticed for quite some time, but the bodies are in an advanced state of decomposition when Yuki finds them and not only that but Yuno's parents are the owner's of the city's biggest bank! Surely somebody would have looked for them after even a few days of being missing.

5 Yuno Is Terrible At Murder

On the flip-side, Yuno doesn't seem to be particularly intelligent when it comes to killing Yuki's friends. In the middle of the show when she's holding Yuki prisoner. Yuno traps his friends in a room that slowly begins filling with gas.

The group escape because not only does the room have an air vent, but that air vent leads directly to the room where Yuno is hiding. What exactly was the plan here? How did Yuno expect to kill them when the gas couldn't fill the room? And what was she going to do about the gas filtering into her own control room?

4 Yuki Is Incredibly Unobservant

Yuki from Future Diary

Part of what makes Yuno and Yuki such a great team is the compatibility of their diaries. Yuno always knows what's happening with Yuki, and Yuki always knows what's happening around himself. The only trouble is this brings up a major question. Yuki has been keeping his diary for some time, noting everything that happens around him, and Yuno has been stalking Yuki for just around a year when the Death Game starts. How in the world did Yuki not notice Yuno before this? If he's constantly observing and recording his surroundings one would think that he'd have noticed the pink-haired girl following him everywhere.

3 Yuno's Diary Works At Night

The exact nature of the diaries is unclear but often when a character is asleep or trapped, their diary only shows that they are asleep or trapped. Yuno's however works during the night time, showing what's happening to Yuki on a 24/7 basis. How this works is unclear as the diary was being kept before Yuno became god, this would imply that Yuno was somehow able to track Yuki's whereabouts at every hour of every day including in the middle of the night when he's asleep.

2 The Third Was Never Caught

Yuno and Yuki's homeroom teacher is both a prolific serial killer and the third diary holder. He's defeated in the first episode and holds little bearing on the series as a whole but his very existence speaks to the incompetence of the police department. We find out later that the police correctly suspected Yuki's teacher but didn't catch him before he was killed.

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That being said, this guy kept a diary of the actions of his victims as well as how he killed them and he'd been keeping this diary for a while. If he was so highly suspected how come nobody found his diary, or searched his phone, or even held him for questioning?

1 The OVA Is Unnecessary

First Second Deus Redial In Future Diary Anime

There are a lot of themes that persist throughout the narrative of Future Diary, but arguably the most consistent is the theme of succumbing to evil. Very few of the characters in the show start as bad people, instead the circumstances of their life push them further and further until eventually they turn to cruelty and violence to gain some semblance of control over their life before they are defeated or killed. Yuki is no exception as by the show's ending, he is cold, bitter, and willing to kill anybody who gets in his way. This leads tragically to the show's ending where he is the only thing that exists in an empty universe although his actions rippled into the third timeline and gave everybody (His third timeline counterpart included) a happy ending. The show has an open ending that perhaps Yuno finds her way back to him. The OVA however spells the whole thing out in saccharine detail taking away whatever poignancy the original ending may have had.

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