Kohinata Hikaru (voiced by Suzuki Eri) is a cheerful and carefree girl. She is too nervous and often does stupid things that make people laugh. Oki Futaba (voiced by Chino Ai) is the opposite of her. She is silent, introverted and timid, and often loses the opportunity to make friends because of this character. But fate makes these two girls with very different personalities meet, and they join the diving club together. Although Ninomiya Ai (voiced by Ohnishi Saori) seems very violent on the surface, but in fact she has a gentle and considerate side, Ninomiya Makoto (voiced by Umehara Yuichiro) who is responsible for making complaints, and the diving club's consultant, who is full of love for diving sports, is surrounded by friends and teachers. Futaba gradually builds up confidence and finds the goal and direction to strive for.