Otona na no yo! / 1oku 3zenman Sō Diet Ōkoku

"Otona na no yo! / 1oku 3zenman Sō Diet Ōkoku" (大人なのよ！／1億3千万総ダイエット王国) is the 34th single by Japanese idol group Berryz Kobo, released in Japan on February 19, 2014.

The physical CD single debuted at 4th place in the Japanese Oricon weekly singles chart.