Akari Sawake, known as Gekko-chan, is a high school student distinguished by her medium-length black hair and striking blue eyes. Her childhood bond with an unnamed individual—referred to as "you"—once included shared sleepovers, but the connection faded after they entered high school. Discovering "your" fascination with ASMR, she procures a dummy head microphone and delves into crafting immersive auditory experiences, hoping to rekindle their bond.

Her ASMR experiments span diverse sounds and scenarios, from tapping bamboo and gliding titanium earpicks to recreating natural ambiances and mundane routines. These creative pursuits intersect with her family life: her sister Hikari and mother Udoku stumble upon her equipment, adding layers of curiosity and tension. Meanwhile, Nanako and Kanako—"your" younger sisters—actively scheme to redirect their sibling’s focus, presenting external obstacles to Akari’s efforts.

The narrative underscores her determination to mend fractured connections through innovative soundscapes, anchoring her actions in a blend of nostalgia, ingenuity, and quiet resolve.