"So Long!" (stylized as "So long !" with a space before the exclamation mark) is the 30th major single by the Japanese idol girl group AKB48. It is also AKB48's sixth cherry blossom-themed single, and its first single of 2013. This single was released in Japan on February 20 in four different versions.

The 64-minute-long music video for the title track is directed by director Nobuhiko Obayashi. The Nippon Television network aired a 3-episode special television drama based on the title track from 11–13 February 2013.

As with many of AKB48's songs, the lyrics were written by Yasushi Akimoto. They begin:

which is romanized as: "So long! ..hohoende! So long! ..jā matane, eda ni ikutsu ka no katai tsubomi, sakurazensen mada konai-noni" and translated as: "So long! ..smiling! So long! ..yeah bye for now, in the branch some hard buds, before the cherry tree still doesn't come"

The music video for the song "So Long!" is directed by Nobuhiko Obayashi and produced by Yasushi Akimoto. With a duration of 64 minutes, it is AKB48's longest music video to date. Shot on location at Chuetsu High School in Niigata Prefecture, this music video revolves around the students at the school.

Mayu Watanabe plays the role of Yume (lit: Dreams), a girl that dreams of becoming an actress. This is Watanabe's first "center" role in an AKB48 music video.SKE48 member Jurina Matsui plays the role of Mirai (lit: Future), a student who transferred to the school from Minamisoma, Fukushima Prefecture after the 2011 Tōhoku earthquake and tsunami. Other supporting cast includes members Haruka Shimazaki, Yuko Oshima, Minami Takahashi, Tomomi Itano and Yuki Kashiwagi.

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