Tom Sawyer is a young boy growing up along the Mississippi River in the mid 1800s. Along with his best friend Huckleberry Finn, he spends his days ditching school, fishing, climbing trees and having adventures.

Tetsurou Hoshino is a boy bent on obtaining an immortal mechanical body in order to take revenge against his mother's murderer, the machine man Count Mecha. However, due to the incredible cost of obtaining what he seeks, his only hope is to steal a boarding pass for the Galaxy Express 999, a space train that travels across the galaxy and whose final stop is a planet where the metal replacements are provided for free. After swiping a pass, Tetsurou is pursued by the police and ends up collapsing into the arms of a mysterious woman named Maetel, who closely resembles his mother. Once he awakens, she tells the boy that she will provide him entry onto the 999 as long as he agrees to travel with her. Accepting her proposition, Tetsurou boards the cosmic railway with Maetel and begins a journey across the galaxy.

[Written by MAL Rewrite]

Aoi and Hinata are childhood friends. Aoi prefers staying indoors and is afraid of heights, whereas Hinata is outgoing and loves mountaineering. They both decide to climb a mountain in order to see a sunrise they saw together when they were younger. In the coming third season, they enjoy hiking beautiful mountains with colored leaves and the story gets even more colorful when they become friends with local school girls!! (Source: Yomiuri TV Enterprise)

Twenty-five years after Éclair and Lumière, (from the flagship Kiddy Grade series), rescued the galaxy from destruction's doorstep, the GTO (Galactic Trade Organization), created after the defeat of the GOTT (Galactic Organization of Trade and Tariffs), act on behalf of universal peace by combating criminal activity. Their special ES division mirrored after the GOTT's ES (Encounter of Shadow-work) force, now includes publicly acknowledged ES member candidates. The series follows two such trainees, Ascoeur and Q-feuille, as they work their way to ES membership. (Source: Wikipedia)