Dr.Haneda was developing experimental giant robot warriors to fight the allies during the Second World War, but before his creations could see action, Allied bombs destroyed the facility and killed him. A decade later criminals discovered two of the surviving prototypes, #26 and 27 in the series, and used the remote controlled robots to commit a number of crimes. Young Shotaro Haneda, the twelve year old son of Dr.Haneda, did some investigating and discovered that the mob were hunting for the twenty-eighth robot in the series, rumoured to be the most powerful of them all. Racing the villains, Shotaro discovers the robot first, along with Dr.Shikashima, a colleague of his father's who was also believed killed by the Allied bombing. Together the two prevent Tetusjin-28 (the robot's official designation) from falling into the hands of the bad guys, and decide to dedicate him to peace rather than war.

Shotaro fought crime for a long time, supported by Dr.Shikashima, who would repair Tetsujin-28 when he was damaged, and by police officer Otsuka. Shotaro even battled the alien Magmans, invaders from the planet Magma, who came to Earth late in his career, bringing their own giant robots, Magma X and Gold Wolf, with them.

[Source: AniDB]

Shotaro had become an Interpol agent, working with Branch Robo, the antirobot crime unit of that organization. He still employs Tetsujin.

[Source: AniDB]

By 2030, Shotaro's son was in charge of Tetsujin-28. An Interpol agent like his father, he used the aged robot to combat the Pink Mafia and the Franken organization.

[Source: AniDB]

The journey begins when Professor Kaneda creates the ultimate soldier robot, Tetsujin, as a substitute for his son, Shotaro, whom he mistakenly believed died in a bomb raid on Tokyo during World War II. To prevent the army from using Tetsujin as a tool for destruction, the professor hides the robot on a remote island. Ten years after the war, Tetsujin is finally resurrected after 28 attempts made by the late Professor Kaneda's protege, Professor Shikishima. Meanwhile, Shotaro has grown up to become a genius boy detective and now joins forces with his beloved Tetsujin to wage a courageous battle against evil!

[Source: Crunchyroll]

Japan, ten years after World War II. Boy detective Shoutarou solves mysteries and fights crime with the help of Tetsujin 28, the 50-foot tall giant robot left for him by his late genius father. But one day he’s shocked to learn that his father also adopted and raised another boy named Shoutarou, now a repatriated soldier. Just as surprising to our young hero is the fact that his “big brother” can also control Tetsujin, even better than he can. But with the emergence of this elder brother comes danger, as a mysterious assassin, Morning Moon, closes in on the boy for being unworthy of controlling the robot. Meanwhile, the capital faces destruction when multiple bombs are discovered, planted by the two Shoutarous’ father himself!

[Source: Crunchyroll]

This series of anime shorts, roughly five minutes in length, will focus on protagonist Shoutarou Kaneda's everyday life instead of focusing on battle scenes as previous Tetsujin 28 titles have done. The visuals of the title robot, its nemesis Black Ox, and other elements will have a pop-art style.

[Source: Anime News Network]