Ayaka Shimoyamada

Mermaids are known worldwide as bewitching mythological creatures of the sea. Despite their charms and otherworldly powers, daily life for these beings comes with everyday problems. But there’s nothing that can’t be overcome with the support of friends. Follow the adventures of five young mermaids as they explore their town and the world around them in this delightful slice-of-life series that takes viewers to an enchanting world beneath the waves.

Taking place in the year 1937 on the eve of World War II, the story involves a mysterious spy training organization known as the "D Agency." The organization is established by Lieutenant Colonel Yuuki from the Imperial Japanese Army. His ideals lead him to recruit people beyond military academy graduates and personnel, while training them to become skilled agents in arts of manipulation. These agents would become a specialized team to conduct operations. One such antihero agent, under the name Jirou Gamou, goes on a harrowing mission to uncover secret documents titled "Black Notes," while battling forces from within and without his own ranks.