Isekai Titles Stopped Fitting On Your Phone

The numbers

I pulled every Japanese anime on AniList since 2000^[1][1] AniList GraphQL API, every Japanese anime and light novel, pulled 2026-10-16, 11,691 entries, and measured every title. After the rules below, 3,164 anime from 2010 to today are left. 241 of them are isekai.^[2][2] My measurement on the AniList data (CSV and code on this page)

How it was measured

Three rules, so the comments can’t take this apart. Plus the details of what got counted.

The curve

From 2010 to 2013 an isekai title had about three words (3.3). Like a normal name: Log Horizon. Then nothing happens for years. 2017: 3.8 words. 2018: 5.5. 2019: almost 7 (6.8), and it never comes back down. 2025: 7.0. 2026 so far: 7.7, and the median isekai title of 2026 is nine words long.^[2]

In characters it is even clearer. Early 2010s: about 20 characters. 2026: 46.1. More than double.

And the Japanese line agrees. The original titles went from about 12 characters (11.9 in 2010 to 2013) to about 21 (21.4 in 2026). So it is not translators padding them out. The source got longer.

There are also more of them. In 2010 isekai was 2.2% of new anime. In 2026 it is 13.2%.

Why 2018? The books jumped first

I also pulled every light novel on AniList: 10,128 of them.^[1] Isekai light novels went from about 5 words in 2013 (4.8) to 8 words in 2016 (8.0). The anime jumped two years later.

The people who measured books before me found the same jump. Red Bard counted English light novel titles and named 2014 as the jump year, with data up to 2017.^[3][3] Red Bard, When Light Novel Titles Started to get so Long (YouTube, 2019) @GenreCodeLovers charted every light novel from 1975 to 2018 in Japanese characters, and titles of 30 or more characters rise from about 2016.^[4][4] @GenreCodeLovers, every light novel 1975 to 2018, reported by Nlab/ITmedia (2019-02-18) I wanted anime, isekai against everything else, up to this month.

Two years is roughly how long it takes for a book to get picked up, produced and aired. So the anime is not where this starts. The anime is the bookshelf with two years of input lag.

Does the studio shorten the title when the book becomes an anime? I matched 296 light novels to their anime. In Japanese, 73% of the anime keep the book’s title exactly, character for character.^[2]

The longest one

There is no official record, so here is mine, by my counting rule. An anime from 2025, based on a web novel from 2020.^[5][5] Wikipedia, Backstabbed in a Backwater Dungeon Its full light novel title, in English:^[6][6] Anime Corner, full title of Backstabbed in a Backwater Dungeon^[7][7] AniTrendz, Hobby Japan announcement (2024-11-15)

Backstabbed in a Backwater Dungeon: My Trusted Companions Tried to Kill Me, But Thanks to the Gift of an Unlimited Gacha I Got LVL 9999 Friends and Am Out For Revenge on My Former Party Members and the World

39 words. In Japanese it is 79 characters.^[8][8] BOOK☆WALKER, longest light novel series names per year The official English title of the anime on AniList is My Gift Lvl 9999 Unlimited Gacha: Backstabbed in a Backwater Dungeon, I’m Out for Revenge!: 15 words. Somebody in localization deleted 24 words. The best compression in this whole project.

It is still not the longest English title in the dataset. Counting every format, movies and OVAs included, the winner is an OVA from 2021:

Is It Wrong to Try to Pick Up Girls in a Dungeon? III: Is It Wrong to Try to Find a Hot Spring in Orario? -Bath God Forever-

28 words. Out of 11,691 anime, the English title with the most words belongs to DanMachi, and it is about a hot spring.^[2]

Is it isekai, or light novels?

Every other anime is growing too, just slower: 3.5 words in 2010 to 2013, 5.4 in 2026. So I split everything from 2018 to 2025 by where the story comes from. This is the real result.

Look at the top two bars. Isekai and non-isekai light novels are almost the same. It is not isekai. It is light novels. Isekai is just the loudest patient.^[2]

And it is spreading. The Japanese e-book store BookLive analysed about 2 million manga titles: the average went from 9.14 characters in 2011 to 18.45 in 2026, and the median from 8 to 16.^[9][9] BookLive manga title study, AdverTimes (2026-09-28)^[10][10] Automaton, English report on the BookLive study Manga is next.

Why light novels: the phone list

A lot of light novels don’t start as books. They start on websites where anyone can post a story. On one of them, Narou, there were over 1.15 million works and about 300 new ones per day in March 2025.^[11][11] shin038 on note, Narou statistics (2025-03-22)

And Narou writers explain it themselves: on a phone, the list shows you basically one thing, the title.^[12][12] posfie/Togetter, Narou writers on phone lists (2019-08-27) No cover, no trailer, no thumbnail. If your title is Log Horizon, nobody knows what your story is. If your title explains your whole story, you used the only space you were given.

So the title is not a name anymore. It is the thumbnail, the trailer and the search keywords, in one string. Narou reportedly stops a title at 100 characters,^[13][13] Narou TS-genre title analysis, n5357hj ch.12 so writers use all 100. Then the story gets popular, a publisher prints it, the title survives, and two years later it is an anime. That is the curve.

The phone, measured

I measured AniList’s own phone layout: a 390 px wide phone, AniList’s 16 px Overpass font, 16 px margins. One full line holds about 40 characters. The small result cards are 115 px wide with a 12 px font and stop after two lines.^[2]

Try it yourself. The line below uses the measured limit of 40 characters (exactly: 40.2).

What gzip thinks of isekai

If all those titles chase the same keywords, they should all sound the same. That can be measured with compression. A program like gzip makes text smaller by finding phrases it has already seen and replacing the repeat with a tiny pointer back. The more repetitive a text is, the smaller it gets.

I took the same amount of title text from each group, 2018 to 2025, and compressed it.^[2]

I am not saying they are all the same title. I am saying gzip thinks they are. The most common words in isekai titles since 2018: "world" (32), "another" (24), "life" (13), "villainess" (10), "reincarnated" (9), "strongest" (7). From 2022 to 2025, one isekai title in five (20.9%) says “another world”.

Real or fake?

If the titles are that repetitive, you don’t need anything smart to write new ones. So I wrote something dumb: markov.py, a word-level Markov chain. It reads every real isekai title and remembers one thing: after these two words, which word came next? It doesn’t know what a villainess is.

In the video, round two was Enough with This Slow Life! I Was Cursed by the Gods (fake) against Chillin’ in Another World with Level 2 Super Cheat Powers (real). The program had kept the first half of a real title and swapped the second. Below, every pair is one fake from the program and the closest real title it found.

The idea of the game is not new: in 2021 Gigguk played real-or-fake with a neural network trained on every BOOK☆WALKER light novel title.^[14][14] Gigguk, This Light Novel Does Not Exist. (YouTube, 2021) The point here is how small the program can be. Two words of memory are enough to fool people, and that says something about how formulaic the titles are.

def train(titles, order=2):
    chain = defaultdict(list)
    for t in titles:
        words = [START] * order + t.split() + [END]
        for i in range(len(words) - order):
            chain[tuple(words[i:i + order])].append(words[i + order])
    return chain


def generate(chain, order=2, max_words=40):
    state, out = (START,) * order, []
    while len(out) < max_words:
        word = random.choice(chain[state])
        if word == END:
            break
        out.append(word)
        state = state[1:] + (word,)
    return " ".join(out)

Does a long title hurt the show?

I took every isekai with enough ratings: 204 shows with a popularity of at least 5,000 on AniList. Title length against score: nothing. The correlation is -0.013, flat. Titles of 5 words or fewer average 66.8 out of 100 (112 shows), titles of 10 words or more average 65.6 (43 shows).^[2]

A long title doesn’t make a bad show. It just tells you where the show was born.

When does it break everything else?

A straight line through the isekai character averages from 2010 to 2025 grows by 1.845 characters per year (r = 0.859). An exponential fit grows by 7.56% per year. Here is when each one crosses the next limit.^[2]

The phone line came true on schedule: the 2025 average is 41.5 characters. The rest has a bug, and it is an honest one. Narou reportedly caps titles at 100 characters, and 11 works in one genre sit at exactly 100.^[13] The longest light novel series names on BOOK☆WALKER have been stuck at 96, 98, 97 and 93 characters from 2021 to 2024.^[8] The trend has a hard limit, and it is a text box. PEP 8’s 79 characters^[15][15] PEP 8, maximum line length are probably safe for a while.

Verdict

So, are long titles bad? I don’t think so. A long title isn’t lazy. It is an interface, built for a list on a phone where nothing else gets seen. And in that list, it works. The title of this video was written the same way.

The code

Everything is plain Python with pandas. To rerun it: fetch_anilist.py downloads, build_dataset.py applies the rules, measure_truncation.py measures the phone layout, analyze.py computes every number.

ISEKAI_RANK = 60

SEQUEL_RE = re.compile(
    r"(\bseason\s*\d|\b\d+(st|nd|rd|th)\s+season|\bpart\s*(\d|ii)|\bcour\s*\d|\b(ii|iii|iv|v|vi)\s*$|"
    r"第.{1,3}期|第.{1,3}部|\bfinal season|2nd|3rd|\bs\d\b)",
    re.I,
)

anime["first_season"] = ~anime.has_prequel & ~anime.sequel_marker
anime["main"] = anime.format.isin(["TV", "ONA"]) & ~anime.adult & anime.first_season & anime.year.notna()

All scripts: fetch_anilist.py, build_dataset.py, measure_truncation.py, measure_phone.py, analyze.py, make_results_md.py, markov.py.