One day, Yoichi, the unluckiest boy in the universe, is run over by a UFO. But the accident triggers a drastic change in his life. He acquires an ability to turn himself into “Lucky Man”, the strongest hero with no ability but the strongest luck. With his luck, he becomes a fearless and undefeated hero. However, Lucky Man can be the weakest hero in the universe when the mother star, the Lucky Star, is hidden. He then looses his lucky power.
Lucky Man fights against evil to protect the peace of the earth with Effort Man, who believes effort is the most important power, and Super Star Man, who does always anything overt. His rough and tumble life seems to go on, even after getting the powers to be Lucky Man. After all, Yuichi is still the unluckiest boy in the universe?!