Tokiwa was the apartment complex where a group of stellar artists lived in 1953. Hiro Terada, Motoo Abiko and Hiroshi Fujimoto, Shotaro Ishinomori, and Fujio Akatsuka shared the trials and tribulations of being struggling young artists and writers with no money and no luck with editors or girls, with a spirit of insane youthful enthusiasm that enabled them to survive the lean years and emerge as stars of the manga firmament.

The Karugamo High School Baseball Team has not been doing well. After losing badly to the Eagles, many of the players leave, and the team now has only eight players, one too few to play a game. Going against his principles, the main character Harumaki Shunpei decides to buy a baseball robot. However, since he does not have enough money, he ends up buying the maid robot named Azusa. Even though Azusa has a warm heart and strong determination, it doesn't appear that she stands a chance against her adversaries who were top-of-the-line baseball robots. The team's only hope seems to lie in a secret buried within Azusa's clouded past.

Jun is a very intelligent little girl who spends her time arranging all kinds of inventions. It goes until creating two small robots, Kichinosuke and Yukinojo, who become her best friends. Because of her intelligence, Jun gets into college at a young age and she meets and falls in love with a boy from her class who's called Zero. Zero is interested in motorbikes and not in school and is accustomed to not attending the courses. He got delayed in his schooling and thus is found much older than the other students and is there for humiliated for it. On the other hand Jun is way too young and little to be in college and is made fun of. Thanks to their common passion for mechanics, Zero will sympathize with Jun and will agree to dine with her in Harbor, the restaurant where Jun's parents live. This is long series of fun adventures and arguments that little Jun will make to allure her charming prince, who's twice older than her.