At 14-years-old, Izuna On discovers he and his brother Motoi are both descendents of Tengu (flying goblin-like creatures of Japan folklore). Motoi has wings, which is somewhat rare among Tengu descendants, while On has the ability to communicate with animals. Due to their heritage, the two brothers live together, separated from normal society, and the story focuses on their everyday lives.
Post-war Yokosuka, Kanagawa Prefecture. Adults who are swayed by the US military stationed in the country and swayed by US intentions cannot afford to care about children who should be protected. The war orphans, who had no choice but to survive on their own, were used to shining shoes for American soldiers, picking up cigarettes, and sometimes committing crimes. However, at some point, they came across a "cleaning" job. They work hard instead of committing crimes and earn money by being appreciated by people. The orphans begin to regain their smiles through experiences that make them feel like they should be alive. The children started to have a modest dream of "renting a house and living" with their own earnings, but they were attacked by an even harsher reality...
"Cutting-edge technology" and "things that haven't changed" coexist in this depopulated town. Takumi, an eighth-year junior high school student, felt it strange that the adults in his town treated the android made in his mother's image as the real thing. However, only Hana, his homeroom teacher, was different from the other adults.
Nagasaki in 1986. Hisada, who lives with her affectionate parents and her younger brother, although there are many quarrels between couples, is a fifth grader who loves Yuki Saito and Exogini. Hisada decides to go to Boomerang Island to "see the dolphins" with Takemoto, whose house is poor and avoided by his classmates. Drowning in the sea, getting entangled in the Yankees, and having a lot of trouble, but as the friendship between the two deepens as a result of this adventure, a sad incident that presages farewell occurs.
Nagasaki in 1986. Hisada, who lives with her affectionate parents and her younger brother, although there are many quarrels between couples, is a fifth grader who loves Yuki Saito and Exogini. Hisada decides to go to Boomerang Island to "see the dolphins" with Takemoto, whose house is poor and avoided by his classmates. Drowning in the sea, getting entangled in the Yankees, and having a lot of trouble, but as the friendship between the two deepens as a result of this adventure, a sad incident that presages farewell occurs.