Motoki Kaizu shares a classroom with Kanna Aoyagi, his lingering gazes sparking rumors of a crush. Unbeknownst to classmates, his attention stems from uncovering her hidden role as a voice actress for erotic games—a secret he unravels through his father’s presidency at an eroge company and his own part-time work at Blue March, the studio managed by Kanna’s sister, Yayoi. Recognizing their shared surname and overhearing internal discussions, he pieces together Kanna’s connection to Yayagi’s projects.

Having voiced characters for Blue March since middle school, Motoki leverages this common ground to bridge the gap between himself and Kanna. Their clandestine voice-acting rehearsals evolve into collaborative sessions, practicing synchronized scenes for ongoing productions. Initial awkwardness gives way to trust as they navigate whispered dialogues and vulnerable performances, their rapport deepening with each shared script.

Kanna’s friends, Kotori and Hazuki, misinterpret Motoki’s intentions, orchestrating scenarios like staged wardrobe mishaps to provoke romantic momentum. He deflects these antics with measured composure, consistently shielding Kanna’s dignity over indulging curiosity. Though reserved, he challenges her directly when secrecy threatens exposure, balancing quiet restraint with decisive action to protect her privacy.

Their partnership gradually shifts from professional alliance to quiet intimacy, overcoming Kanna’s fears about her voice-acting trance eroding personal firsts and her hesitance to confront mutual attraction. By the manga’s close, unspoken tensions dissolve in a reciprocal confession, cementing their transition from guarded collaborators to acknowledged partners.