A spacecraft lands on one of the five Fuji lakes about 100km west of Tokyo. But nobody has seen the flying object because its special material and rotation are invisible to the human eye. The spaceship is operated by Machineman, and outer space man, who is from the planet Machine, a bright and pleasant place to live. He is handsome and of masculine countenance. When you graduate from university at Machine, you must submit a report of a trip to the Galaxy. Machineman chose the solar system as his theme and came to earth. Machineman takes a great interest for himself in earthling things. He looks for an apartment in order to meet earthmen and study their culture. A series of strange incidents have reportedly been occurring recently. One family loving father has caused a traffice accident. A gentle, kind mother falls and is badly hurt. Another incident involves a lovely girl who is blown into the lake by a gust, Their families are heartbroken and are thrown into despair. Giving full play to his super energy, Machineman confronts the secret criminal organization Tentacles.