Konosuke Harada

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.

"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.