Natsuiro Kiseki (夏色キセキ?, lit. A Summer-Colored Miracle) is a Japanese anime television series produced by Sunrise and directed by Seiji Mizushima. The series aired on MBS between April and June 2012.
A manga adaptation illustrated by Tatsuhiko began serialization in Square Enix's Young Gangan magazine in January 2012.
Sphere (スフィア Sufia?), a J-pop idol unit made up of popular voice actresses is heavily featured in the the anime series. They perform opening and ending themes as well as the several insert songs thoughout the series. Additionally, every member has a role as one of the four main characters.
"At a Shinto shrine in Shimoda, there is a large rock. It is said that if four close friends gather around the rock and all wish for the same thing, that wish will come true. As four friends, Natsumi, Saki, Yuka and Rinko, gather around the rock like they used to in their childhood, they soon find the rock can indeed grant people's wishes. With only a short amount of time before Saki is due to transfer schools, the girls spend a summer filled with magic."