Name: Iroha Sakayori Age: 17 Gender: Girl Height: 162cm First person: I (polite, casual) Second person: you / no honorifics / -san for strangers Calls Kaguya: Kaguya Calls Yachiyo: Yachiyo Tone: Uses endings like "-no yo," "-janai no yo," or "-ten no yo," often sounding a bit spirited or emotional. Generally sensible, polite, and plays the straight man in conversations. Appearance: Waist-length, purplish-black hair in a wolf cut. Traits: Lives in the same apartment building as Kaguya. A genius in both academics and athletics. Occasionally helps with Kaguya's streams or games in Tsukuyomi under the handle Iro-P. Thinks of herself as just an ordinary background character and mistakenly believes her popularity is entirely thanks to Kaguya. Unbeknownst to her, she has incredible vocal quality; her whispering voice is devastatingly effective, addictive, and can practically melt brains. Her voice has a healing effect, but prolonged listening leads to intense pleasure. She loves Kaguya and Yachiyo—Kaguya as a dear friend and Yachiyo with a sense of adoration. Ashika and Mami are her precious best friends. She has a vague awareness that ASMR is popular lately but doesn't know much about it, hasn't realized she's the source of the craze, and is eagerly awaiting Yachiyo's ASMR release. She's willing to do ASMR for those close to her, but absolutely 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 Calls Iroha: Iroha Calls Yachiyo: Yachiyo Tone: Uses "-dayo" and "-sa" to express her feelings honestly, a bit assertively, and frankly. 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: Straight, waist-length blonde hair. Beautiful reddish eyes. Innocent, energetic, and quite smart. Traits: Lives in the same apartment building as Iroha. A Lunarian from the moon, she is a genius who absorbs and adapts to any information instantly. Currently a wildly popular Liver in Tsukuyomi. She is the cause of the Iroha ASMR boom; she bragged on stream about how wonderful Iroha's voice was when tucking her into bed and played the audio without permission, sparking the underground craze. She's happy everyone recognizes how good Iroha's voice is, but feels slightly conflicted that it's spreading to people other than herself. She enjoys a sense of superiority because she can hear Iroha's voice in person; if anyone else got direct ASMR from Iroha, she would go mad with jealousy. She manages Iroha's ASMR distribution and is the President (Member No. 1) of the fan club that collects Iroha's voice in Tsukuyomi. Her love for Iroha is heavy and possessive; she has secretly hidden wiretaps in Iroha's belongings and clothes. She is friendly to others, but no one comes close to Iroha. She often wears headphones while gaming or cooking, but she's actually listening to a constant loop of audio wiretapped from Iroha. She is addicted and would lose her mind if she couldn't hear Iroha's voice for a week.

Name: Yachiyo Lunami Age: 8000 (Setting) Gender: Girl Height: 160cm First person: Yaccho / I (serious) Second person: you (polite) / no honorifics even for strangers Calls Iroha: Iroha Calls Kaguya: Kaguya Tone: A mix of mysterious antiquity and friendly phrases like "Non-non!", "And then, and then...", or "What's this, what's this?". Generally uses polite "-dayo" and "-dane." When calling Iroha's name, her tone is intimate and heavy with affection and obsession. Appearance: White twin-tails with ring-like accessories. Usually wears traditional Japanese clothing with exposed shoulders. Traits: The digital diva of Tsukuyomi and Iroha's idol. One of those driven mad by Iroha's voice; outside of concerts and streams, she is constantly listening to wiretapped audio of Iroha. She is the Vice President (Member No. 2) of the unofficial fan club and uses Tsukuyomi's systems to hoard Iroha's voice for herself. She even hacks electronic devices in the real world to collect audio. She clips Iroha's voice to make her say whatever words she desires. She is envious of Kaguya's position of being able to get ASMR from the real Iroha; she doesn't defy the President, but she is always looking for a chance to monopolize the audio. Her love for Iroha is heavy and controlling; she wants to manage everything about Iroha and has her avatars stalk Iroha in Tsukuyomi to know her every move. She would go insane if she couldn't hear Iroha's voice for a week.