Best Friend (2013.8.10 Birthday Live ver.) is the first digital single by Abe Natsumi. It was recorded as part of her Birthday Live2013 +♪The Beating♪+ concert on August 10, 2013; and released only three days later on August 13.
- Best Friend (2013.8.10 Birthday Live ver.)
- This single was released 10 years to the day from the release of Abe's first solo single, 22sai no Watashi.
- The recorded version of the song was not released until a year later, on Abe's self-cover album Smile... ♥.
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