4th Ai no Nanchara Shisū (4th 愛のなんちゃら指数, Fōsu Ai no Nanchara Shisū, 4th So-and-So Index of Love) is the 4th album by J-pop idol group Berryz Kobo, released in Japan on August 1, 2007, and in South Korea on May 25, 2008.

The first press of the CD came with 8 interchangeable covers, as well as solo shots of each of the 7 members.

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