- Okuba (奥歯; Back Teeth)
- Akimoto Yasushi
- Yamamoto Katsuhiko
- Other Information
- Arrangement: Shimizu Teppei
Artist: Shirogumi (白組)
- (Center: Yamamoto Sayaka)
- Team N: Ogasawara Mayu, Kishino Rika, Kinoshita Haruna, Kadowaki Kanako, Yamaguchi Yuuki, Yamamoto Sayaka
- Team M: Azuma Yuki, Murakami Ayaka, Yamagishi Natsumi, Yamada Nana
- Team BII: Kamieda Emika, Kusaka Konomi
There are currently two versions of "Okuba" to be found in NMB48's discography. These versions are:
- Okuba (Original)
- Found on the Type-A edition of the "Bokura no Eureka" single as track #3 and the Theater edition of said single as track #2.
- Okuba off vocal ver.
- Found on the Type-A and Theater editions of the "Bokura no Eureka" single as track #6. This is the standard version without the main vocals.