NMB48 made history when they became the first female musical act to debut with three consecutive number one singles. Now the girls attempt to continue their streak with their first summer-themed single Nagiichi! The girls" fourth single is a bright cheerful idol pop tune that encourages young girls to build up their own confidence. The single includes Rifujin Ball by the Under Girls team and an additional song as B-side tracks. This edition includes Hatsukoi no Yukue to Play Ball by the NMB Seven team as the second B-side track. It comes with a bonus DVD containing two versions of the Nagiichi music video and volume three of "NMB48 featuring Yoshimoto Shinkigeki".