"Tokumu Sentai Shinesman" is a comedic manga series that parodies the conventions of corporate culture and the tokusatsu (special effects) superhero genre. The story centers around a group of office workers who are secretly recruited by the alien corporation Shines to serve as Earth's protectors, the Shinesmen. These employees must balance their mundane office jobs with their duties as costumed heroes, battling alien threats sent by rival corporations.

The protagonist, Sakomizu, is a salaryman who becomes the leader of the Shinesmen, known as Shinesman Red. His team includes colleagues from his office, each assigned a specific color and role: Matsumoto as Shinesman Green, a laid-back and somewhat lazy employee; Ishihara as Shinesman Gray, a serious and dedicated worker; and Seki as Shinesman Sepia, a quirky and eccentric individual. Together, they fight against alien invaders who often represent exaggerated corporate stereotypes, such as aggressive sales tactics or unethical business practices.

The narrative blends workplace satire with action-packed superhero battles, highlighting the absurdity of both corporate life and traditional superhero tropes. The Shinesmen's missions often involve navigating office politics, meeting deadlines, and dealing with their demanding boss, all while donning their colorful, spandex-like uniforms to fend off extraterrestrial threats. The series humorously juxtaposes the mundane struggles of office life with the over-the-top drama of tokusatsu battles, creating a unique and entertaining dynamic.

Throughout the story, the Shinesmen face various challenges, both in their professional and heroic roles. They must contend with rival teams, internal conflicts, and the constant pressure to perform well in their jobs. The manga explores themes of teamwork, perseverance, and the often ridiculous nature of corporate hierarchies, all while maintaining a lighthearted and comedic tone. The characters' dual lives as office workers and superheroes provide ample opportunities for humor and satire, making "Tokumu Sentai Shinesman" a distinctive and engaging series.