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Running along the list of unanswered questions, I came along the question
about different EDs each episode. And I wondered, has there been an anime that
actually switched its OP and ED during the runtime of the show? And if so,
which one(s) would that be?


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theme-song
Has there been a anime that used its OP as ED and/or vice versa?


This is not uncommon - a number of shows will have a first episode with no
song at the beginning, and with the OP at the end of the episode. I'll pull in
some examples of this later.

There are also somewhat more unusual cases like Madoka (as Memor-X points out
in the comments), in which "Connect" (usually the opening) was used as the
ending song in episode 10.

* * *

But, for a particularly amusing example of this, look at **Hanamonogatari**.
In the Monogatari series, OPs are always sung by the voice actors, and EDs are
sung by other singers. Hanamonogatari's OP was "the last day of my
adolescence" (by Kanbaru Suruga / Sawashiro Miyuki), and the ED was "Hanaato
-shirushi-" (by Kawano Marina).

Since Hanamonogatari was broadcast as a continuous ~2-hour long special, the
OP and ED each only ran once - but the ED was played at the beginning, and the
OP was played at the end! Imagine that!

(I think this is because the OP visuals and lyrics are spoilery for
Hanamonogatari, whereas the ED visuals/lyrics aren't? But I'm not sure about
that.)


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This questions seems answered to me, but since it isn't accepted yet, maybe I
can add some more info.

From [this](https://anime.stackexchange.com/questions/8194/what-was-the-first-
anime-that-uses-different-ending-opening-songs-in-every-episo/18823#18823)
question I have a local copy of the database powering [ANN's
encyclopedia](http://www.animenewsnetwork.com/encyclopedia/). So with this in
hand I looked for titles, that had the same songs as both OP and ED (at some
point, not necessarily the same episode).

All title comparisons are done case insensitive to catch annotation
inconsistencies. There are no checks for episodes - as long as an OP becomes
and ED or vice versa at some point during the anime, it counts (once). The
code can be found
[here](https://gist.github.com/JonasR/9680bd90ac681a49ef28#file-calc2-py).

### Results

If we only take the song's title independent of the artists performing it,
there are 233 cases from 216 animes. You can see the full list of titles
[here](https://gist.github.com/JonasR/9680bd90ac681a49ef28#file-same_title-
markdown). If we only consider cases where not only the title was swapped, but
it was also performed by the same artist, there are still 210 cases from 194
animes (full list
[here](https://gist.github.com/JonasR/9680bd90ac681a49ef28#file-
same_title_and_artist-markdown)). In other words, there are 23 titles that not
only swapped positions, but at the same time also got a new artist. Then
again, upon manual inspection only 14 of these cases turned out to be true,
the rest can be attributed to some kind of inconsistent annotation by ANN.

It is probably safe to assume there are more errors, but the numbers should at
least be roughly correct. I did my best catch all of the systematic
inconsistencies. (The results also confirm the three cases mentioned in
senshin's answer)

**Most swaps:** The only title to have three songs swapped is
[_Major_](http://www.animenewsnetwork.com/encyclopedia/anime.php?id=4115). The
openings [Saraba Aoki Omokage](https://www.youtube.com/watch?v=ipucDn3k0DQ),
[Play the Game](https://www.youtube.com/watch?v=BFSPwpt3idI) and [Kokoro
e](https://www.youtube.com/watch?v=TE5oSlDgGD4) were used as endings in 4
episodes in total, even with the same artists. The full lists for the number
of swaps per anime is here ([including same
artist](https://gist.github.com/JonasR/9680bd90ac681a49ef28#file-
swaps_per_anime-markdown), [title
only](https://gist.github.com/JonasR/9680bd90ac681a49ef28#file-
swaps_per_anime_title_only-markdown)).


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