"Amanchu! OVA" is an original video animation that serves as a continuation of the Amanchu! anime series. It follows the adventures of Pikari and Teko, two high school girls who share a passion for diving and exploring the underwater world. The OVA features lighthearted moments and emphasizes friendship, personal growth, and the beauty of nature. The OVA includes several short stories that highlight the characters' experiences and interactions with their friends. It showcases the serene underwater scenery and the joy of diving, while also delving into the characters' emotional journeys. Overall, "Amanchu! OVA" captures the essence of the original series while providing additional content for fans.