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Heartsworn Abyss: NighTmaRes [v0.73] [sky blue aster]

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4.8 Rating 36 Views Updated Sep 4, 2026

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Rei Tsukiyora is a jaded man who runs a pawnshop in Miyogawa’s seedy underworld. One evening, he comes across a

Rei Tsukiyora is a jaded man who runs a pawnshop in Miyogawa’s seedy underworld. One evening, he comes across a despondent Akari Hashimoto fleeing from her captors. Unable to abandon a young girl to the dangerous streets, Rei begrudgingly takes her in, offering her a reprieve until she finds her bearings.

One thing leads to another, however, and Akari’s stay becomes more… permanent than he had envisioned. For Akari, who has only led a high-flying life, and for Rei, a man living by the skin of his teeth, life together is… manageable (if not amusing).

While Akari may have renounced her past life as an heiress, fate won’t let them go that easily. Akari’s entrancing looks and eminent status catch the eyes of Ryuichi Satou. As the head of Miyogawa’s largest company, he spares no resources on seducing her. An irate Ryuichi even accosts the pair at Rei’s residence, though Akari flatly rejects him.

Humiliated, the scorned prodigy concocts a grand scheme that will lead to the hostile takeover of Akari’s company, and eventually, her heart. He swears to sully every fiber of her innocence. As for Rei… Ryuichi vows to bury him in an everlasting abyss.

Our no-AI promise:
From beginning to end, Heartsworn Abyss is made by humans for humans!

Thread Updated: 2026-09-04

Release Date: 2026-08-22

Developer: sky blue aster Patreon – Subscribestar – Homepage – Discord – X – YouTube

Censored: No

Version: 0.73

OS: Windows, Linux, Mac, Android

Language: English

Voices: Japanese

Store: Steam (Wishlist) – Saikey – Itch.io

Genre:

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Installation:

1. Extract and run.

Changelog:

v0.73

fixed a crash in Chapter 6

v0.72

you can now play the all-ages version from start to finish (untick the NighTmaRes DLC)

v0.71

added several hours of voice acting
Chapter 6 is now fully voiced! (Akari, Shiori)
Shiori’s VA is the super cute Hiiragi Koyomi (柊木こよみ)!
added voices to a couple lines in previous chapters
fixed typos, errors, etc.

v0.70

Chapter 7 released
main route now available (one H-scene)
some side routes are playable; others will be added at a later date
added “Chapter Select” function
start from any chapter in the game
three presets are provided for Akari

v0.64

Added voice acting for the extended scenario in Chapter 1

v0.63

Added a new scenario in Chapter 5
One new HCG

v0.62

Made it easier to enter the “pure” route
All hidden choices are now revealed by default
You must meet the requirements to select them

v0.61

Fixed bugs, typos, and redundancies
Reduced difficulty of unlocking certain choices

v0.60

Chapter 6 released
Added two new characters, one H-scene
※If the game starts in windowed mode, it might stretch beyond your screen if your display resolution isn’t 4K. Pressing F should fix it! After that, you can specify window size in the options.

v0.56

4K update. Enjoy your favorite redhead in ultra-high-def! (Shiori+ only)
Two new CGs. Bzz, bzz!
One new H-scene in Chapter 1. Voice acting will be added after feedback.
Greatly expanded the scenario where Akari & Midori are separated.
New NVL system. Text now perfectly fits inside the message box and will auto-clear once full. Previously this was manually cleared, so it’s a huge improvement in efficiency.
Gallery reworked. Get a sneak preview of Shiori’s sprite!
Fixed several bugs, typos, and redundancies.

v0.41b
N/A
v0.40

Chapter 4 is now live (15k words)! Please enjoy Rei and Akari’s… sweet moments together!
Various under-the-hood optimizations
Fixed various typos (thanks FhulHuse)

v0.36

Akari has hundreds of new voice lines for Chapter 1, expanded to include all bonus scenarios. Every single one of her lines are now voiced.
All stock BGV tracks have been replaced by custom, looping ones voiced by Hibari-san
Various UI fixes

v0.35

I’m happy to announce that Heartsworn Abyss v0.35 is now available for download!

This is a major update adding a new, alternate route in Chapter 1. Of course, it comes with a long, “romantic” scene as well! 😉

To access it, play Chapter 1 and allow the “unknown” person to enter when Akari is alone in the restroom.

v0.34

I’ve released an update that restores all of Midori’s missing lines. Thanks so much for bearing with me.

v0.33p

New voice acting for Midori (20 mins of dialog) -Tons of new voice lines for Akari in Chapters 1 & 2 -JP localization (Chapters 1-3 playable in Japanese, languages swappable in-game)

v0.32p

This update adds over 30 minutes of voice acting to Akari in Chapter 3. Routes A and B are now completely voiced for your viewing pleasure. Enjoy!

v0.3p

Chapter 3.

Embark on a harrowing chapter where Akari must use all every tool at her disposal. Will the Crimson Princess manage to escape from her brutal kidnappers unscathed?

v0.2p

This chapter is voiced and contains 4,500 words. Akari may have a few voiceless lines; these will be added in at a future date. (I was working on this chapter when the voice actress was finishing the first batch of recordings.)

Chapter 2 has several under-the-hood improvements such as bug fixes, improved audio quality, and prettier text animations. I had intended to bundle this with Chapter 3, but I’ve decided to release it early while I let Chapter 3 cook. Anyhow, let me know if there are any bugs or the sort in this build

v0.1p

Initial Release

Prologue, Chapter 1.

Estimated length: 24k words

Voiced? Yes, but Akari’s missing a few lines near the middle-end!

Sorry, I got a touch of inspiration and wrote a bunch of lines after recording was done! T

hese will be revoiced in v0.2.

No romantic scenes in this one since it’s all about the slow buildup.

However, there are a few spicy scenes if you’re into “that.” Next release will turn the heat up.

Developer Notes:

As Rei & Akari, navigate through the island-nation of Miyogawa, a curious amalgam of old-time charm and new-age innovation. While it‘s celebrated as a land of promise, don’t let its glittering lights distract you from the squalor that lies underneath. The beautiful walls may appear polished to perfection, but a solid foundation cannot rest on a rotten core…

Can Rei, a broken man whose life is on the mend, hope to oppose the sinister machinations of Saitou Corporation? Or will he and Akari be swallowed by Miyogawa‘s darkness, to be strung along like broken puppets?

Heartsworn Abyss is an interactive visual novel. Key decisions will have to be made at several points in the story. Miyogawa is an enigmatic place replete with events that are both absurd and inevitable. Abase, betray, lie… do whatever it takes to get by. Only through tainting oneself can one hope to slog through the mire…