Koyomi History

Story: 6/10
Art: 5/10
Sound: - /10
Characters: 10/10
Enjoyment: 7/10

Koyomi History is an animated adptation of the homonym side story published in the Madogatari Exhibition pamphlet, written by Nishio Ishin (Also known as NISIOISIN), the Monogatari Series author, and it talks about Koyomi Araragi remembering the girls he tried to help.
This special "episode" is represented on a white background, it has no sounds (except for the characters voices)(this is why i have not rated the sound) and we can see all the main Bakemonogatari characters, with Koyomi as protagonist.
Also Koyomi History is placed (by the reading order) after Orokamonogatari, in the Off Season of the novel that doesn't ... have an anime adaptation yet.
I think this episode doesn't deserve a 7 as overall rating, but I personally enjoyed to watch this side story animated (I'm a huge Monogatari Series fan, that's why) even if the art is not this good (really minimal and doesn't literally add anything very important to the episode) and there is no background sounds.

I might as well write a review for this as the vast majority of people don't seem to be able to understand what this short is trying to do. In my humble opinion, this is a masterpiece as it perfectly encapsulates the feelings of my experience watching Monogatari.
TL;DR at the bottom.

Story - 10
Since this is less than 4 minutes long, it's obvious that they have to be economical with there time. Therefore the story is simple: it's just Araragi reminiscing about the five main girls of the series and that's all it needs to be. Some may claim that there should have been 'more' somehow ... but, i think you're judging it by the wrong standards.

I think it's best to judge it like a piece of music, with the dialogue being the lyrics. The best stories and, by extension, music conveys the emotions that the writer was feeling while writing - lets you experience those emotions. Koyomi History does exactly that. It puts me in the frame of mind to reminisce on the time I've spent watching these characters struggle, grow, laugh, love and hate. With very few words it conveys the accumulative emotion of the entire series for me.

Art - 10
Now, sure, there's very little animation and no backgrounds but, does there need to be? I think not. By keeping the visuals minimal - a vast departure from the usual style - it allows you to concentrate fully on the characters, assisting that reminiscence. Araragi not even being shown in the short also helps keep this focus - it's not about his experience.

Sound - 10
Again, just because the only sound is the voice acting doesn't mean that it's bad. I'm probably getting repetitive but, it's all in service of creating the best atmosphere to reflect there's nothing but the characters.

Character - 10
It's Monogatari, so yes the characters are great and they all get to show what makes them great. This stimulates that contemplative mood. Some may argue that it doesn't offer anything 'new' and to that, I'd say it's called Koyomi HISTORY for a reason.

Enjoyment - 10
As you can probably tell, I enjoyed it. It allowed me to experience some of my fondest memories again and somehow gave me lots to think about despite hardly saying anything at all.

Overall - 10
This is a masterpiece as it delivers the emotional impact of an entire series in less than four minutes. However, this is only for people who love Monogatari and it's characters.

[FREE SPOILER REVIEW]

When I see this special I think that it'll be cool, but no, sincerely I don't understand this special, but resuming it's the Monogatari's characters talking and/or asking for Koyomi, but it's not relevant for the story of Monogatari, it's only one more random special, that it's not worth watching if you want to watch it, isn't hard, you need only to search in YouTube for "Koyomi History", and you can find the episode subbed, different from some special ones, that only exist the episode non-subbed
Now, about the art, it's very good, as the normal episodes, but they're in a white space, with ... nothing more, only the characters, and Koyomi doesn't appear, only what he said written on the white screen; the episode doesn't have any music or anything else, only their voices.