"Hello, This is Terumi" centers on Terumi, a high school student who leads a double life as a popular online streamer. Known for her bubbly and energetic persona online, Terumi hides her true identity from her classmates, fearing judgment and the potential loss of her privacy. Her online fame brings both opportunities and challenges, as she navigates the complexities of maintaining her secret while dealing with the pressures of school, friendships, and her growing audience.

The narrative explores themes of identity, authenticity, and the impact of social media on personal relationships. Terumi’s interactions with her classmates, particularly her best friend Yui and the observant but reserved classmate Haruto, reveal the tension between her online and offline selves. Yui, unaware of Terumi’s streaming career, often expresses admiration for the online persona, creating an ironic dynamic. Haruto, on the other hand, begins to suspect Terumi’s secret, leading to moments of introspection and conflict as Terumi grapples with the fear of exposure.

As the story progresses, Terumi faces dilemmas that force her to confront the consequences of her dual life. A rival streamer emerges, threatening to expose her identity, while her growing popularity demands more of her time and energy. These challenges test her relationships and her sense of self, culminating in a pivotal moment where she must decide whether to reveal her true identity to those closest to her.

The series balances lighthearted moments with deeper emotional undertones, portraying the struggles of a teenager trying to reconcile her public and private lives. Through Terumi’s journey, the narrative examines the pressures of online fame, the importance of genuine connections, and the courage it takes to embrace one’s true self.