Michika has a deep weakness for attractive voices, and the student council president exploits this mercilessly. Possessing both an irresistible face and a voice that sends shivers down her spine, the sadistic upperclassman knows exactly how to manipulate her. He observes that Michika cannot refuse him whenever he uses that voice, so he capitalizes on this by ordering her to act as his girlfriend. Despite his thoroughly selfish and domineering attitude, Michika finds herself powerless to resist him on an almost instinctive, DNA level. The story unfolds as a romantic comedy centered on their relationship, with Michika constantly being teased, toyed with, and overwhelmed by the president's confident and controlling behavior.

As their relationship develops from a one-sided arrangement into a genuine, albeit unconventional, romance, the president begins to show glimpses of an awkward kindness beneath his surface, deepening Michika's feelings. The narrative escalates with the introduction of Wanko-kun, a sleep-support streamer whose voice had been helping Michika rest. When Wanko-kun unexpectedly transfers to her school, a new romantic rival enters the picture, further complicating the dynamics and testing the bond between Michika and the president. The story continues to follow Michika's journey as she is constantly swept up in the whims of the handsome, good-voiced upperclassman who keeps her.