Demetrios, a timid pottery painter in an ancient Greek village, possesses innate athleticism that clashes with his gentle artistry and fear of competition. His muscular build and messy light brown hair hint at unused potential, fueling conflict as the village mayor pressures him to seek Olympic glory instead of pottery. Demetrios resists, terrified of the violence and societal shame awaiting defeated athletes, like being pelted with rocks or enduring bloody contests.

His life transforms dramatically when, hiding inside a large urn during distress, he is struck by lightning. This transports him to 1964 Tokyo, a place he dubs "Tokyopolis," where his disorientation leads him to mistake a local for Zeus. Immersed in modern Japanese culture during the 1964 Summer Olympics, he observes and participates in contemporary sports and society, discovering an unexpected enjoyment in physical activities and competition.

Repeated lightning strikes shift him between ancient Greece and modern Tokyo. He begins integrating knowledge and innovations observed in Japan – modern athletic techniques and organizational methods – into his village. This cross-cultural exchange sparks personal growth, turning him from a fearful outsider into a proactive leader. He channels his newfound confidence to organize and participate in a local "Tolympics," using his athletic abilities to unite villagers and resolve conflicts peacefully. His journey culminates in winning the mayor's approval and marrying Apolonia, the mayor's daughter, signifying his full integration into the societal fabric he once avoided.