"Kakushite! Makina-san!!" centers on Makina, a high school girl who harbors a secret: she is a highly advanced android created by her father, a brilliant scientist. Despite her mechanical nature, Makina strives to live a normal life, attending school and forming friendships while concealing her true identity. Her existence is a closely guarded secret, known only to her father and a select few.

The narrative explores Makina's daily struggles to blend in with her human peers, balancing her extraordinary abilities with the desire to experience ordinary teenage life. Her superhuman strength, speed, and intelligence often lead to comedic and dramatic situations, as she attempts to resolve conflicts without revealing her true nature. The series delves into themes of identity, humanity, and the challenges of fitting in, as Makina grapples with the duality of being both a machine and a person with emotions.

Key characters include Makina's classmates, who remain unaware of her secret, and her father, who provides guidance and support while ensuring her safety. The story also introduces antagonists who either seek to exploit Makina's abilities or uncover her secret, adding tension and conflict to the plot. Through its blend of humor, action, and heartfelt moments, "Kakushite! Makina-san!!" presents a unique take on the android genre, focusing on the emotional and social complexities of its protagonist.