Masayoshi Hazama is a young man who works as a fashion model while secretly pursuing his childhood dream of becoming a superhero. He was raised by a grandfather who loved tokusatsu action heroes, and that influence led him to create the costumed identity of Samurai Flamenco, a name his grandfather originally conceived. Despite having no superhuman powers, high-tech armor, or formal combat training, Masayoshi decides to fight crime and uphold justice by patrolling the streets of Yukimachi in Shibiru City. His approach to heroism is idealistic and uncompromising: he believes a hero should never give up, never hide, never be defeated, and never accept evil, and he applies this belief even to minor offenses like jaywalking or littering. In his civilian life, Masayoshi is shy and reserved, but when he dons his costume he becomes enthusiastic and determined, though his early efforts are clumsy and often result in him being beaten by the criminals he tries to apprehend.

Masayoshi's driving motivation is to live out the hero fantasy he admired as a child and to make the world a better place by standing up against all forms of wrongdoing. His role in the story begins as a small‑scale vigilante who gradually attracts public attention. After a chance encounter, police officer Hidenori Gotou discovers his secret identity and becomes his closest ally, providing practical support and grounding Masayoshi’s lofty ideals. Over the course of the series, Masayoshi builds relationships with other characters who join his cause: idol Mari Maya, who takes on the alias Flamenco Girl; her bandmates Mizuki Misawa and Moe Morita, who form the Flamenco Girls; veteran tokusatsu actor Joji Kaname, who serves as a mentor figure; and scientist Jun Harazuka, who supplies him with weaponized everyday items. His bond with Gotou deepens significantly, culminating in a proposal that expresses his wish to protect and care for him.

As the narrative progresses, the threats Masayoshi faces escalate from ordinary muggers and umbrella thieves to literal monsters and a villainous organization called Torture, led by King Torture. This shift forces Masayoshi to adapt quickly: he learns to fight more effectively, gains experience through repeated battles, and eventually becomes a recognized symbol of justice on a national and global scale. His development involves confronting the gap between his childish idealism and the harsh realities of heroism, including the revelation of his parents’ death and the moral complexities of fighting genuine evil. By the end of the series, Masayoshi matures into a hero who understands the weight of his responsibilities and finds a balance between his public persona and his private self. Although he possesses no innate superpowers, his greatest asset is his unwavering sense of justice and his refusal to abandon his principles, which inspire those around him and drive him to face increasingly impossible odds.