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.
Unfortunately the movie Sabakan is not yet available on HBO Max.
| Sound | Michiru Oshima | Original Music Composer |
| Directing | Tomoki Kanazawa | Director |
| Writing | Tomoki Kanazawa | Screenplay |
| Writing | Jun Hagimori | Screenplay |
| Production | Tamotsu Osano | Executive Producer |
| Production | Tomonori Fukuda | Line Producer |
| Production | Michi Iijima | Executive Producer |
| Production | Jun Takahashi | Producer |
| Production | Mitsuru Sato | Producer |
| Camera | Yusuke Suga | Director of Photography |
| Art | Takuya Okada | Art Designer |
| Editing | Narihiko Kôno | Editor |
| Costume & Make-Up | Reiko Matsushita | Costume Designer |
| Lighting | Yamato Watanabe | Lighting Director |
| Sound | Masaharu Tanabe | Sound Recordist |
| Sound | Kotaro Marubashi | Music Producer |
| Art | Takayuki Sato | Set Decoration |
| Directing | Dan Ogawa | Assistant Director |
| Directing | Kazuya Shintani | Assistant Director |
| Costume & Make-Up | Asako Nagashima | Makeup & Hair |
| Crew | Emiko Togawa | Script |
| Costume & Make-Up | Kayo Hosomi | Hairstylist |
