In a world where humans coexist with androids called Neans, a group known as the Immortal Nine rises up against society. Tasked with disposing of the revolters, a Nean named Rouge Redstar (aka Metal Rouge) and investigator Naomi Orthmann head to Mars to track them down…but first, Rouge wants some chocolate.

Saving the world... by fishing? Yuki Sanada has always felt like a fish out of water. Socially awkward and anxious, he struggles to fit in with his surroundings and moves from town to town with his grandma. As he and his grandma settle into the charming seaside town of Enoshima, Yuki hopes for a fresh start. However, his reputation at school is jeopardized by the arrival of fellow transfer student Haru. The eccentric Haru immediately makes a splash, wildly claiming to be an alien and declaring that Yuki is his friend. Pairing the reluctant Yuki with their classmate and fishing talent, Natsuki Usami, he tasks both of them with the absurd mission of saving the world from a mysterious threat in the ocean. Mischief and hijinks ensue, as these three embark on a whimsical adventure filled with laughs, heart, and self-discovery!

Life in Brailsford Junction, Wisconsin, is simple and quiet for Sterling North, who spends most of his free time caring for animals. With his mother in the hospital and his brother fighting on the Western Front, the boy lives only with his father and his dog Hauser. One weekend, cutting away from his usual chores, Sterling, his friend Oscar, and Hauser head off on a fishing trip. On their way to the river, his dog catches a scent at the base of a tree. Unearthing a raccoon's nest, the two boys find an orphaned kit. A passing hunter has killed the kit's mother to make a fur hat, leaving Sterling to adopt and care for the orphaned raccoon. Torn by his fracturing family, a brother in the trenches, along with the ailing health of his mother, Sterling's bonds with life and the world around him are kept together and strengthened by life with his new friend, the "ring-tailed wonder" and scoundrel, whom he names Rascal.

High school student Aoi Aioi lives with her elder sister, Akane, after a tragic accident took their parents away 13 years ago. Because Akane has since been taking care of her single-handedly, Aoi wants to move to Tokyo after her graduation to relieve her sister's burden and pursue a musical career, inspired by Akane's ex-boyfriend Shinnosuke "Shinno" Kanamuro. Shinno was part of a band until he left for Tokyo to become a professional guitarist after the sisters' parents passed away, and he was never to be seen again.

One afternoon, while Aoi practices her bass in a guest house, she gets startled by the 18-year-old version of Shinno from 13 years ago! As if by coincidence, the current 31-year-old Shinno also returns to the town, but he has changed drastically. There are now two Shinno's in existence, but why is the Shinno from the past present?

Sora no Aosa wo Shiru Hito yo revolves around these four individuals as they confront their inner feelings toward each other and make decisions that will affect their lives from here on out.

[Written by MAL Rewrite]