[2][3][4] The manga was published in Square Enix's magazine Monthly Shōnen Gangan from August 2009 to October 2011, with its chapters collected in five tankōbon volumes.

Upon hearing of a new toy robot called the Heybo, Joey believes that getting one will make his life better, turning him into a hero to protect his friends and family.

However, when it gets struck by a bolt of strange lightning, it transforms into a giant robot, just in time to save his friend Lina from impending danger.

The Skrugg (スクラッグ, Sukuraggu) are an evil race of cockroach-like aliens, led by Kogorr, who travel to Earth in order to invade it after being inadvertently contacted by Denton.

A manga adaptation of Heroman, illustrated by Tamon Ohta, was serialized in Square Enix's Monthly Shōnen Gangan from August 12, 2009 to October 12, 2011.