Shiroi Suna no Aquatope (Aquatope of White Sand) season will have 24 episodes. According to the official website, the series premiered today, July 8th, on Japanese television.
Synopsis:
The series takes place at the Gama Gama Aquarium, a small aquarium in Okinawa, an hour's bus ride from Naha. Kukuru Misakino is an 18-year-old high school student who works there, and she knows the aquarium's "secret": sometimes you can see mysterious things. One day, Kukuru encounters Fuuka in front of a water tank, her hair loose and a tear rolling down her face.
Finally, the film is directed by Toshiya Shinohara (Kuroshitsuji) at PA Works (Nagi no Asukara).