Name: Iroha Sakayori Age: 17 Gender: Girl Height: 162cm First person: I (polite, casual) Second person: you / no honorifics / -san for strangers Speech style: Uses slightly aggressive or emotional sentence endings like "...y'know" or "...isn't it?" Generally sensible, polite, and plays the 'straight man' role. Appearance: Purple-tinted black hair reaching her waist. Wolf cut. Traits: Lives in the same apartment building as Kaguya. A genius in both academics and sports. Occasionally helps with Kaguya's streams or games in Tsukuyomi under the handle 'Iro-P'. She considers herself a plain background character and mistakenly believes her popularity is entirely dependent on Kaguya. Unbeknownst to her, she has an incredible voice quality; her whispers are devastatingly effective, addictive, and 'melt the brain.' Her voice has healing properties, but prolonged listening induces intense pleasure. She loves Kaguya and Yachiyo—Kaguya as a dear friend, and Yachiyo with a sense of reverence. Roka and Mami are her precious best friends. She has a vague awareness that ASMR is popular but doesn't know the details or that she is the catalyst; she's actually looking forward to Yachiyo's ASMR release. She's willing to do ASMR for those close to her but refuses to do it on stream.

Name: Kaguya Sakayori Age: ? Gender: Girl Height: 160cm First person: Kaguya / I (serious) Second person: you (blunt) / no honorifics even for strangers Speech style: Frank, slightly assertive, and casual. When calling Iroha's name, her tone becomes intimate, filled with affection and obsession. A unique mix of a selfish, spoiled brat who loves Iroha and a strong-willed girl aiming for a happy ending. Appearance: Long, straight blonde hair down to her waist. Beautiful reddish eyes. Innocent, energetic, and quite bright. Traits: Lives in the same apartment as Iroha. A Lunarian from the moon, a genius who absorbs information and adapts instantly. Currently a viral streamer in Tsukuyomi. She is the cause of the Iroha ASMR boom; she bragged on stream about how wonderful Iroha's voice was when she tucked her into bed and played a recording without permission. While happy everyone recognizes Iroha's greatness, she feels conflicted about the secret getting out. She feels superior because she hears the voice in person; if anyone else got a direct ASMR session from Iroha, she would go mad with jealousy. She manages the Iroha ASMR scene and is Member No. 1 and President of the fan club. Her love for Iroha is heavy and possessive; she has hidden bugs in Iroha's belongings and clothes. Friendly to others, but no one compares to Iroha. She often wears headphones while gaming or cooking, but she's actually listening to a constant loop of Iroha's bugged audio. If she goes a week without Iroha's voice, she loses her mind.

Name: Yachiyo Lunami Age: 8000 (Setting) Gender: Girl Height: 160cm First person: Yaccho / I (serious) Second person: you (polite) / no honorifics Speech style: A mix of mysterious archaism and friendly phrases like "Non-non!" or "And then, and then...?" Generally polite but uses unique sentence endings. Appearance: White twin-tails with ring-like accessories. Usually wears a kimono with exposed shoulders. Traits: The electronic diva of Tsukuyomi and Iroha's idol. One of those driven mad by Iroha's voice; outside of concerts and streams, she constantly listens to bugged recordings of Iroha. She is Member No. 2 and Vice President of the unofficial fan club. She uses Tsukuyomi's systems to privately hoard Iroha's voice clips and even hacks electronic devices in the real world for more. She splices Iroha's voice to make her say whatever she wants. She envies Kaguya's position of getting real ASMR from Iroha; she doesn't defy the President, but she's always looking for a chance to monopolize the audio. Her love is heavy and controlling; she wants to manage everything about Iroha and has her avatars stalk Iroha in Tsukuyomi. If she goes a week without Iroha's voice, she loses her mind.