Farther and farther you fall [down the rabbit hole]
Who will you find there, God or the Devil? [kanatan's god moning and angel towa]

This was rather fun. It's mostly in the natural minor, but it does occasionally switch to the harmonic minor for the major dominant chord.
Also, I have a slight bias towards songs with a key change when going into the chorus, in this case A minor to D minor down the circle of fifths.
I attempted to contrast the two voices by varying the harmony within the right hand part. Kanata's is more 'pure' with smaller extensions, and Towa's is richer with larger chord extensions.
The use of extensions was definitely inspired by their vocal timbre and has nothing to do with the difference in their chest size.
----------------------------------------------------------------------------------------------------------------
Sheet Music:
https://musescore.com/user/35982457/s...
Alternate link for PDF:
https://drive.google.com/file/d/1Pe7F...
MIDI file:
https://drive.google.com/file/d/1rLZG...

madoromi (マドロミ), the theme song of Square Enix's brand-new RPG "Deep Insanity ASYLUM", vocals by Amane Kanata and Tokoyami Towa, arranged for piano by me.

Original MV:
   • 【MV】マドロミ / 天音かなた・常闇トワ【ディープインサニティ アサイ...  

Art Sources
Thumbnail: From the original MV.
Background: The original MV.

(From the original video's description)
"Deep Insanity ASYLUM" theme song, with vocals by Amane Kanata and Tokoyami Towa.
Service is scheduled to officially commence on October 14, 2021!

Square Enix's brand-new RPG "Deep Insanity ASYLUM".
Is it truth or madness that you seek?
Follow a young man with amnesia's journey and explore the depths of insanity found deep underground in this mystery!

Title: Deep Insanity ASYLUM
Launch Date: Thursday, October 14, 2021 (service officially commences)
Platform: iOS/Android/PC(STEAM)

▼Download Links▼
iOS / Android → https://sqex.to/dcUJW
PC(Steam) → https://store.steampowered.com/app/16...

▼Official HP: https://www.jp.square-enix.com/deepin...
▼Official Twitter：  / deepinsanity_pj  

▶︎Appearances▷
Be sure to follow and subscribe to your favorite!
[Amane Kanata]    • 【壺並走】かなトワ勝負！！ラストに重大告知あり！！【天音かなた/ホロライブ】  
[Tokoyami Towa]    • 【壺並走】#かなトワ で…対決🔥とかいう前に10分以上プレイできる気がしな...  

Vocals: Amane Kanata, Tokoyami Towa
Lyrics, Composition: Taketeru Sunamori (Mirai Kodai Orchestra)
Keyboard, Strings Arrangement: Miyako Matsuoka (Mirai Kodai Orchestra)
Drums: HAZE
Violin: Atsuki Yoshida (EMO strings)
Violin: Anzu Suhara
Viola: Izumi Kawamura
Cello: Kirin Uchida
Bass: Takumi Kagahara
Recording Studio: studio MSR

Recording & Mixing Engineer: NNZN (OFUTONE)
Vocal Direction: Kassan (Neko Hacker)
Movie: Konbu
Illust: Yomosaka, Ordan

Translation: fts
Subtitling: T-chan