Unlike traditional anime that follows a single narrative arc, Eternity operates as a collection of short stories. Each episode features a unique pair of protagonists—often professionals like office workers, CEOs, or doctors—navigating the complexities of adult relationships. This format allows the series to touch on a wide variety of romance tropes, ranging from "forbidden" office flings to rekindled childhood flames.

Unlike live-action adult content, leverages the power of imagination. The source material from Eternity Books is surprisingly well-written. The plots, while steamy, often include genuine emotional stakes, betrayal, longing, and redemption. By adapting these into audio dramas, the channel strips away visual distractions, forcing the listener to focus on the timbre of a whisper, the catch of a breath, or the desperate crack in a voice.