Nazo no Kanojo X: Nazo no Natsu Matsuri

Mysterious Girlfriend X: A Mysterious Summer Festival

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Alternative Titles

Japanese: 謎の彼女X 謎の夏祭り
English: Mysterious Girlfriend X: A Mysterious Summer Festival
More titles


Type: OVA
Episodes: 1
Status: Finished Airing
Aired: Aug 23, 2012
Producers: None found, add some
Licensors: None found, add some
Source: Manga
Genres: MysteryMystery, RomanceRomance, EcchiEcchi
Demographic: SeinenSeinen
Duration: 26 min.
Rating: PG-13 - Teens 13 or older


Score: 7.281 (scored by 2456824,568 users)
1 indicates a weighted score.
Ranked: #27822
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #3278
Members: 44,372
Favorites: 91

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Ranked #2782Popularity #3278Members 44,372
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Episodes: /1


OVA released with the 9th volume of the manga.

The day when Tsubaki goes to the summer festival with Ueno, Oka, and Urabe.


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Related Anime

Characters & Voice Actors


Nagai, Masaru
Sumiya, Kenji
Watanabe, Ayumu
Mima, Masafumi
Sound Director


Opening Theme

Apple Music
Amazon Music
Youtube Music
"Koi no Orchestra (恋のオーケストラ)" by Ayako Yoshitani

Ending Theme

"Houkago no Yakusoku (放課後の約束)" by Ayako Yoshitani


Mar 29, 2022
Honestly, this "episode" was buried so deep under other memories I thought it was from an another anime. It's very pleasing seeing a little bit more of their interactions. As of right now, I haven't seen anything like this, this is still an original anime no one has tried recreating anything of this kind, it's honestly so refreshing to see new in old. Just remembering this and how I watched it on my old phone will always stay in my head. Nothing screams more nostalgia than this. It is just pure quality it is very interesting seeing the outcome of their actions. I highly recommend ...
May 29, 2020
Nazo no Kanojo X: Nazo no Natsu Matsuri (2012)

Well, this is a pretty nice OVA and takes directly from the main series. Leaves a hole from the beginning with a question by Akira but it does not affect the storyline at all. It also contains a nice cameo from another series that is much shorter which was nicely done and made for a pretty unexpected turn of events.

The art again is of an unpolished standard in my opinion that hasn't stood greatly with the drool of an odd off-putting colour and style. It is though rather average of its time and is good enough. ...
Feb 18, 2022
Mixed Feelings
An OVA to throw up possible false flags and confuse viewers more on the mysteries of what is Urabe in the anime. As much as the fan wiki describes her as human, I have never known saliva swapping experience give such emotional reactions, or tell me if someone has no panties on.

So we continue down the same horrible route of the anime in that way, with fox yokai involved as an idea pr so they say when testing their love, with similar body fluid swapping used by them. But no idea why saliva transfer stimulates thoughts or emotions of the other.

As ...

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Recent News

OVA of Nazo no Kanojo X Announced

According to Amazon Japan, an OVA of Nazo no Kanojo X was announced to be released on August 23rd. It will be bundled with the ninth volume of the original manga. more

Recent Forum Discussion

Poll: Nazo no Kanojo X OVA Episode 1 Discussion ( 1 2 )
Kokujin-kun - Aug 22, 2012
65 repliesby yveltalkyogre »»
Apr 3, 2023 3:13 PM
Artix86 - Aug 27, 2012
4 repliesby SpectrumDT »»
May 10, 2018 3:47 AM