Nurse Angel Ririka SOS is a Japanese manga series created by music producer and television writer Yasushi Akimoto and manga creator Koi Ikeno. The manga was serialized in Shueisha's shōjo manga magazine Ribon from January 1995 to June 1996, and subsequently collected into four bound volumes published by Shueisha. The story follows Ririka Moriya, an elementary school student who receives the power to transform into the legendary guardian, Nurse Angel. As Nurse Angel, she is the only person capable of protecting the Earth from world-destroying invaders.

Yasushi Akimoto is a Japanese record producer, lyricist, and television writer, best known for creating and producing some of Japan's top idol groups, Onyanko Club and the AKB48 franchise. Total sales of the singles he has written exceed 100 million copies, making him the best-selling lyricist in Japan.