AniDB

From a video, I am trying to read an episode name. I can identify all characters but one, because it looks like just a simple dash '-'.

So what is the correct spelling?

1) さ一くる
2) さーくる
3) さ～くる
4) さっくる

I know that the meaning is "circle". And the anime is "Akiba-kei Kanojo".

The character for the long vowel is correct, so 2).