In a near-future where androids dominate daily life and human-to-human romance is widely considered inefficient and obsolete, a young man named Tsuzure Fuuta struggles with a rare allergy to androids that prevents him from participating in the convenience-driven world around him. Determined to find love the old-fashioned way, he trains relentlessly to become attractive to human women, but his efforts are hampered by his condition and his own thick-headedness. Watching over him is his childhood friend, Waganabe Ren, a quiet and earnest girl who has secretly carried feelings for him ever since she inadvertently rejected him when they were younger. Fuuta remains completely oblivious to her affection, and Ren realizes that as herself she will never break through his wall of unawareness.

Desperate to be close to the boy she loves, Ren makes a drastic decision: she will disguise herself as a prototype android specially designed to be allergy-safe and approach Fuuta under the false identity of Yamada Blue Hawaii. Posing as the perfect, responsive, and trouble-free android companion, Ren enters Fuuta’s life in a double existence—by day she is the ordinary, slightly reserved childhood friend at school, and by night she is the artificial girlfriend who fulfills his longing for connection without triggering his allergy. The central tension of the story comes from the elaborate lie: Ren must maintain the flawless mechanical demeanor of an android while hiding her very human feelings, and Fuuta, who gradually opens his heart to his android partner, remains unaware that the person he is falling for is actually the girl he has known all along.

The setting is a world in which android romance is the norm, relationships are judged by cost-performance, and genuine human emotion is seen as messy and inefficient. This backdrop casts every moment of the deception in a bittersweet light, as Ren’s choice to "stop being human" in order to be loved mirrors the story’s title. The narrative follows the comedic and heartfelt complications of Ren’s double life—narrow escapes from discovery, jealous rivals, misunderstandings, and the slow but inevitable erosion of her disguise. Key arcs include a summer trip where Fuuta’s growing dependence on Yamada Blue Hawaii clashes with his lingering attentiveness toward Ren, a cultural festival incident that nearly exposes the truth, and the introduction of a genuine android who poses a real romantic threat. Ultimately, the manga explores whether a love built on a fabricated identity can survive, and whether Fuuta will ever see the real Ren standing right in front of him.