"Natsu no Free & Easy" ) is the 9th single by Nogizaka46. It was released on July 9, 2014. It debuted in number one on the weekly Oricon Singles Chart. It was the best-selling single in July. It has sold a total of 481,533 copies, as of August 25. It reached number one on the Billboard Japan Hot 100. It was the 11th best-selling single of the year in Japan, with 526,564 copies.

Rena Matsui is a Japanese actress, singer, and novelist. Matsui is a former member of the Japanese idol girl groups SKE48 and Nogizaka46. As a member of the former, she also participated in the main lineup of AKB48's singles. As an actress, she has played roles in numerous films and television series, including Kamen Rider Build the Movie: Be the One and the 99th NHK asadora Manpuku.