"Return to Myself ~ Shinai, Shinai, Natsu." (Return to Myself 〜しない、しない、ナツ。, lit. "Return to Myself ~ Not, Not, Summer.") is the ninth single by Japanese singer/songwriter Mari Hamada, from the album of the same title. Written by Hamada and Hiroyuki Ohtsuki, the single was released by Invitation on April 19, 1989. The song was used by Kanebo Cosmetics for their commercials starring Nene Otsuka. It was included in the 2015 soundtrack album Yakuza 0 80's Hits! Collection.
"Return to Myself ~ Shinai, Shinai, Natsu." was covered by Japanese all-female power metal band Cyntia as their second single, released on July 31, 2013 by Colourful Records. Three versions of the single were released: a stand-alone single, the Type-A single with a DVD copy of the music video, and the Type-B single with a promotional bikini top.
The single peaked at No. 36 on Oricon's singles chart.