Nazo no Kanojo X

Mysterious Girlfriend X

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Alternative Titles

Synonyms: MGX
Japanese: 謎の彼女X
English: Mysterious Girlfriend X
German: Mysterious Girlfriend X
Spanish: Nazo no Kanojo X: Mysterious Girlfriend X
French: Mysterious Girlfriend X
More titles


Type: TV
Episodes: 13
Status: Finished Airing
Aired: Apr 8, 2012 to Jul 1, 2012
Premiered: Spring 2012
Broadcast: Sundays at 01:30 (JST)
Licensors: Sentai Filmworks
Source: Manga
Genre: RomanceRomance
Theme: SchoolSchool
Demographic: SeinenSeinen
Duration: 24 min. per ep.
Rating: PG-13 - Teens 13 or older


Score: 7.231 (scored by 148998148,998 users)
1 indicates a weighted score.
Ranked: #30762
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #753
Members: 319,887
Favorites: 3,239

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Streaming Platforms

New Interest Stack

Interest Stacks

Animeby Manaban

These are H&E series I'd categorize as "Progressive."

This doesn't indicate quality, originality, or anything sociopolitical so much as being H&E series that have priorities which radically depart from traditional H&E priorities. They could do anything from use some wacky narrative structure to implementing ecchi in some way to focusing more heavily on the MC relative to the harem. Things that go outside of the priorities stated in the traditionalist stack, and either in ways that are far too pronounced to be considered moderate, departing from tradition far too often to be considered moderate, or both.

I'm not saying these series don't tend to appeal to H&E fans, or might appeal more to people who don't typically like H&E. I'm saying that these are the series that don't adhere to traditional sensibilities within the genre, for better or for worse.

15 Entries · Apr 7, 2022 5:25 AM


Animeby NotTaiga7

Have you ever wanted to get into the Girlfriend series but didn't know which order to watch it in?
well, I've taken the liberty of ordering them for you chronologically! Watch as all the stories slowly connect! Enjoy the Girlfriend series!

Disclaimer: This is obviously a joke. The "Girlfriend" series does not exist. I just wanted to put a bunch of shows with "girlfriend" in the name into one stack so me and others could watch them. (Watch as the shows slowly decline. this is gonna be great! Hope you end up finding a show you like!)

9 Entries · Apr 10, 2022 11:48 AM


Animeby Niyuri

A stack of heroine with glasses in anime for those who love glasses.

48 Entries · Apr 28, 2023 2:20 PM


Animeby Gyro__Z

Comedy Anime With Great Well Written Characters...

18 Entries · May 3, 2022 12:43 AM


Animeby Mushroomen

Thank you user for the idea. But I feel you got the saga wrong. Let me help you add to it. (also in canon order)

8 Entries · Dec 5, 2022 8:10 PM


Animeby PurePureHeart

Denpa as a genre usually refers to Japanese artistic works with themes associated with social isolation, existentialism, insanity that stems from living modern society, and the glorification of otaku/outsider cultures. Examples of denpa in other mediums include the films of Hideaki Anno (Love and Pop, Ritual) and the films of Shunji Iwai (All About Lily Chou-Chou), as well as the visual novel Wonderful Everyday Down the Rabbit-hole.

For more about denpa, check out this excellent blogpost about the genre:

35 Entries · Dec 18, 2022 2:22 AM


25 Entries · May 24, 2022 11:41 PM


Animeby YusukeU

I was paying attention, that a genre that is very pleasant to watch, are subtext romance works, but there are several of them, so I decided to add only those focused on couples.

The real intention of the list is to separate romantic comedy focused on couples in their jobs or school, compared to the rest.

33 Entries · Aug 18, 2023 7:52 PM


Animeby TinyIgnition

Dorohedoro-40, Fire Force-174, Demon Slayer-100, Mysterious Girlfriend X-37
Nisekoi-106, One Outs-82, Pandora Hearts-33, Sasameki Koto-13, Slam Dunk-185
Usagi Drops-25, Bloom Into You-25, Black Clover-270, Bleach-480, Nagatoro-47
Land of the Lustrous-30, Toilet Bound Hanako-36, Girlfriend Girlfriend-36
Rent a Girlfriend-50, Talentless Nana-28, One Punch Men-85, Tokyo Revenger-73
Reincarnated as a Slime-87, Record of Ragnarok-20, God of High School-112
Tower of God-78, In/Spectre-16, Doctor Stone-83, Made in Abyss-26, Haikyuu-291
Vinland Saga-54, Attack on Titan-130, Golden Kamuy-191, JoJo6-47, My Hero-258
To Your Eternity-54, Jujutsu Kaisen-63, Dress-Up Darling-40, Shadows House-47
Ranking of Kings-155, Sasaki to Miyano-32, Duke of Death and His Maid-68
Tonikaku-45, HunterxHunter-340, Girl's Last Tour-33, World God Only Knows-190
March Comes in Like a Lion-89, Hajime no Ippo-556, Teasing Master Takagi-100
Grand Blue-21, Mob Psycho-91, Noragami-38, Bungou Stray Dogs-54

50 Entries · May 30, 2022 2:08 AM


Animeby Aikawa_Yuji

This is the second part of the stack I created which includes all romcom anime I had hunted. Well, 50 entries maximum is not enough to include all romcom anime I know so if you are interested to see what entries are in part 1 you can visit my account and see my created "interest stacks" for the 1st part of this stack. All hail the romcom god!

50 Entries · Jun 2, 2022 3:35 PM


Animeby VanVeleca

To all the insomniacs who can't sleep unless there's something playing on a TV or their phone, this is for you. Pleasant or decently average shows you don't really need to pay attention to while watching and drift off to slumber.

32 Entries · Mar 31, 8:21 AM


Animeby Screenaholic

And some with story that is terrible so it doesn't really count and some anime that I thought belonged in here that was wholesome, sad and emotional

50 Entries · Sep 27, 2022 6:24 AM


Animeby LENDASlegend

50 Entries · Oct 13, 2022 12:37 PM


Animeby dreamingneon

anime featuring weird girls who have a prominent role in the series in which they appear

10 Entries · Mar 22, 2023 12:04 PM


Animeby NoahPP

46 Entries · Jan 24, 2023 2:07 AM


Animeby Matesilver

Animes where an ordinary guy meets a special girl who changes her day. the new romcom formula

7 Entries · Jan 29, 2023 7:10 PM


Animeby Majoux

No open end (to some extent, in some)
No harem, bl or gl
No ecchi (or slightly in some)
*They are tagged as romance genre or romantic subtext theme, the degree of romance content varies and some blooms in sequels which will require patience.
!After completing the anime it's recommended checking out the sequels, movies and/or source materials, if they have those, to confirm couples getting together and/or for further developments.
*Please do specified research before giving your time to watch.
The list is full but replacements with better quality new animes will happen, therefore it's suggested getting the ones you consider watching on your list.

Upcoming romances:

Nonshcool/ Adult romances:

50 Entries · Yesterday, 11:21 AM


Animeby DokiDokiSame

Anime with both comedy and romance, usually romantic banter or some type of rivalry... and of course tsunderes.

18 Entries · Feb 16, 2023 1:03 PM


Animeby sohayou

My favourite romance anime

11 Entries · Mar 15, 2023 9:35 AM


Animeby Zalis

A list of anime containing ecchi elements, but are not tagged as ecchi by MAL. While the ecchi content may not be as prevalent or extreme as officially-tagged ecchi titles, there is still enough to be of interest to fans of the ecchi genre. Many of these register at least 1.5/3 stars on AniDB's "tag-weighting" system for ecchi.
Conversely, those who don't care for ecchi may wish to use this stack for cautionary purposes, as these titles may contain things like pantyshots, revealing outfits, incestuous overtones, oversized/jiggling breasts, swimsuit/lingerie moments, extended bath/shower scenes, lewd dream/fantasy sequences, innuendo, or general fanservice in an otherwise serious/"respectable" show.
Only the first seasons of franchises are listed. Some titles may (eventually) have additional details explaining why I've placed them on the list.

Part 2:
Part 3:

50 Entries · Jul 19, 2023 10:03 PM