Sister Other Paranoia
| App ID | 4240150 |
| App Type | Game |
| Developer | HazeDenki |
| Publisher | Serenity Forge |
| Franchise | Serenity Forge |
| Supported Systems | Windows |
| Technologies | Unity Engine |
| Last Changenumber | 39283029 |
| Last Record Update | 28 September 2026 – 19:40:42 UTC ( |
| Release Date | 15 August 2026 – 03:00:14 UTC ( |
A dark visual novel by acclaimed creator nyalra. Overly sensitive to other people's emotions, the protagonist—a light novel writer—develops the ability to read minds, only to be driven even deeper into isolation. His sole remaining comfort is his younger sister, gifted yet lonely.
Steam price history
Special Promotion, ends 8 October 2026
Current Price
-20% $7.99
Lowest Recorded Price
-20% $7.99
15 August 2026
| Currency | Current Price | Converted Price | Lowest Recorded Price | ||
|---|---|---|---|---|---|
 U.S. Dollar |
-20% $7.99 | $7.99 | $7.99 | -20% $7.99 | |
 Ukrainian Hryvnia |
-20% 192₴ | $4.27 | -46.53% | $4.27 | -20% 192₴ |
 Russian Ruble |
-20% 372 ₽ | $4.46 | -44.16% | $4.46 | -20% 372 ₽ |
 Chinese Yuan |
-20% ¥ 31.20 | $4.65 | -41.76% | $4.65 | -20% ¥ 31.20 |
 Chilean Peso |
-20% CLP$ 4799 | $4.88 | -38.81% | $4.88 | -20% CLP$ 4799 |
 Mexican Peso |
-20% Mex$ 91.19 | $4.99 | -37.55% | $4.99 | -20% Mex$ 91.19 |
 Brazilian Real |
-20% R$ 26,39 | $5.04 | -36.81% | $5.04 | -20% R$ 26,39 |
 Colombian Peso |
-20% COL$ 16895 | $5.08 | -36.41% | $5.08 | -20% COL$ 16895 |
 Philippine Peso |
-20% ₱319.99 | $5.10 | -36.06% | $5.10 | -20% ₱319.99 |
 South African Rand |
-20% R 85.59 | $5.12 | -35.80% | $5.12 | -20% R 85.59 |
 Indian Rupee |
-20% ₹ 499 | $5.18 | -35.13% | $5.18 | -20% ₹ 499 |
 LATAM - U.S. Dollar |
-20% $5.19 | $5.19 | -35.04% | $5.19 | -20% $5.19 |
 MENA - U.S. Dollar |
-20% $5.19 | $5.19 | -35.04% | $5.19 | -20% $5.19 |
 SASIA - U.S. Dollar |
-20% $5.19 | $5.19 | -35.04% | $5.19 | -20% $5.19 |
 Thai Baht |
-20% ฿175.20 | $5.21 | -34.74% | $5.21 | -20% ฿175.20 |
 Indonesian Rupiah |
-20% Rp 93679 | $5.23 | -34.44% | $5.23 | -20% Rp 93679 |
 Vietnamese Dong |
-20% 136500₫ | $5.25 | -34.28% | $5.25 | -20% 136500₫ |
 Malaysian Ringgit |
-20% RM21.59 | $5.28 | -33.84% | $5.28 | -20% RM21.59 |
 Peruvian Sol |
-20% S/.18.39 | $5.30 | -33.64% | $5.30 | -20% S/.18.39 |
 Kazakhstani Tenge |
-20% 2440₸ | $5.50 | -31.14% | $5.50 | -20% 2440₸ |
 Uruguayan Peso |
-20% $U240 | $5.95 | -25.47% | $5.95 | -20% $U240 |
 Saudi Riyal |
-20% 22.48 SR | $5.97 | -25.26% | $5.97 | -20% 22.48 SR |
 CIS - U.S. Dollar |
-20% $5.99 | $5.99 | -25.03% | $5.99 | -20% $5.99 |
 Hong Kong Dollar |
-20% HK$ 47.19 | $6.01 | -24.73% | $6.01 | -20% HK$ 47.19 |
 Taiwan Dollar |
-20% NT$ 192 | $6.01 | -24.70% | $6.01 | -20% NT$ 192 |
 Singapore Dollar |
-20% S$7.72 | $6.03 | -24.48% | $6.03 | -20% S$7.72 |
 Japanese Yen |
-20% ¥ 960 | $6.08 | -23.87% | $6.08 | -20% ¥ 960 |
 Qatari Riyal |
-20% 22.39 QR | $6.14 | -23.12% | $6.14 | -20% 22.39 QR |
 Kuwaiti Dinar |
-20% 1.91 KD | $6.18 | -22.60% | $6.18 | -20% 1.91 KD |
 Polish Zloty |
-20% 30,39zł | $7.81 | -2.22% | $7.81 | -20% 30,39zł |
 U.A.E. Dirham |
-20% 28.84 AED | $7.85 | -1.72% | $7.85 | -20% 28.84 AED |
 Canadian Dollar |
-20% CDN$ 11.19 | $7.87 | -1.50% | $7.87 | -20% CDN$ 11.19 |
 Norwegian Krone |
-20% 77,60 kr | $8.06 | +0.93% | $8.06 | -20% 77,60 kr |
 Israeli New Shekel |
-20% ₪24.79 | $8.07 | +1.00% | $8.07 | -20% ₪24.79 |
 New Zealand Dollar |
-20% NZ$ 14.39 | $8.07 | +1.06% | $8.07 | -20% NZ$ 14.39 |
 Australian Dollar |
-20% A$ 11.99 | $8.31 | +4.04% | $8.31 | -20% A$ 11.99 |
 Swiss Franc |
-20% CHF 7.19 | $8.66 | +8.47% | $8.66 | -20% CHF 7.19 |
 Costa Rican Colon |
-20% ₡4000 | $8.74 | +9.49% | $8.74 | -20% ₡4000 |
 South Korean Won |
-20% ₩ 11840 | $8.75 | +9.60% | $8.75 | -20% ₩ 11840 |
 Euro |
-20% 7,99€ | $8.98 | +12.47% | $8.98 | -20% 7,99€ |
 British Pound |
-20% £7.99 | $10.55 | +32.07% | $10.55 | -20% £7.99 |
Valve suggested prices are shown on package pages.
Price history
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Additional Information
| Developer | HazeDenki | |||||||||||||||||||||||||||||||||||||||||||||||
| controller_support | partial | |||||||||||||||||||||||||||||||||||||||||||||||
| ReleaseState | released | |||||||||||||||||||||||||||||||||||||||||||||||
| Publisher | Serenity Forge | |||||||||||||||||||||||||||||||||||||||||||||||
| Store Release Date | 15 August 2026 – 03:00:19 UTC ( |
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| osarch | 64 | |||||||||||||||||||||||||||||||||||||||||||||||
| community_hub_visible | Yes | |||||||||||||||||||||||||||||||||||||||||||||||
| Social Media | https://discord.gg/v776EdbgwM https://x.com/__your_sister__ https://www.xiaohongshu.com/user/profile/694d02330000000026003b3f |
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| Primary Genre | Adventure (25) | |||||||||||||||||||||||||||||||||||||||||||||||
| Store Genres | Adventure (25), Indie (23) | |||||||||||||||||||||||||||||||||||||||||||||||
| Steam Release Date | 15 August 2026 – 03:00:14 UTC ( |
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| Store Asset Modification Time | 15 August 2026 – 08:53:10 UTC ( |
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| library_assets |
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| osextended | empty string | |||||||||||||||||||||||||||||||||||||||||||||||
| name_localized |
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| review_score | 6 | |||||||||||||||||||||||||||||||||||||||||||||||
| review_percentage | 73 | |||||||||||||||||||||||||||||||||||||||||||||||
| Detected Technologies | Unity Engine, Mono SDK, SteamworksNET SDK, UnityBurst SDK, UnityURP SDK, cURL SDK | |||||||||||||||||||||||||||||||||||||||||||||||
| Steam Deck Compatibility |
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| Content Descriptors | Frequent Violence or Gore (2), General Mature Content (5) | |||||||||||||||||||||||||||||||||||||||||||||||
| controllertagwizard | Yes | |||||||||||||||||||||||||||||||||||||||||||||||
| First seen on SteamDB | 8 December 2025 – 06:01:45 UTC ( |
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| Content Descriptors (Including DLC) | Frequent Violence or Gore (2), General Mature Content (5) | |||||||||||||||||||||||||||||||||||||||||||||||
Supported Languages
| 3 Languages | Interface | Full Audio | Subtitles |
|---|---|---|---|
| English | Yes | Yes | |
| Simplified Chinese | Yes | Yes | |
| Japanese | Yes | Yes |
Assets
Load all asset images
| trailer_name | Launch Trailer |
| trailer_category | 3 |
| microtrailer ↴ | |
| video/webm | 4240150/918175042/ff72cb973e78864bbb001de54d8fe54641fabcc4/1786759139/microtrailer.webm |
| video/mp4 | 4240150/918175042/ff72cb973e78864bbb001de54d8fe54641fabcc4/1786759139/microtrailer.mp4 |
| adaptive_trailers ↴ | |
| dash_av1 | 4240150/918175042/ff72cb973e78864bbb001de54d8fe54641fabcc4/1786759139/dash_av1.mpd |
| dash_h264 | 4240150/918175042/ff72cb973e78864bbb001de54d8fe54641fabcc4/1786759139/dash_h264.mpd |
| hls_h264 | 4240150/918175042/ff72cb973e78864bbb001de54d8fe54641fabcc4/1786759139/hls_264_master.m3u8 |
| screenshot_medium | 257399809/dd3779881325c5de2e3e8ef8f99b1ea4e636ef30/movie_600x337.jpg |
| screenshot_full | 257399809/dd3779881325c5de2e3e8ef8f99b1ea4e636ef30/movie_full.jpg |
| all_ages | true |
| is_highlight | true |
| timestamp | 15 August 2026 – 03:04:49 UTC |
| trailer_name | BGMMovie |
| trailer_category | 2 |
| microtrailer ↴ | |
| video/webm | 4240150/1335533180/f7eac95bdb6c8fe5bc90e37f1d43c696c5d14c22/1786085056/microtrailer.webm |
| video/mp4 | 4240150/1335533180/f7eac95bdb6c8fe5bc90e37f1d43c696c5d14c22/1786085056/microtrailer.mp4 |
| adaptive_trailers ↴ | |
| dash_av1 | 4240150/1335533180/f7eac95bdb6c8fe5bc90e37f1d43c696c5d14c22/1786085056/dash_av1.mpd |
| dash_h264 | 4240150/1335533180/f7eac95bdb6c8fe5bc90e37f1d43c696c5d14c22/1786085056/dash_h264.mpd |
| hls_h264 | 4240150/1335533180/f7eac95bdb6c8fe5bc90e37f1d43c696c5d14c22/1786085056/hls_264_master.m3u8 |
| screenshot_medium | 257256709/0629a6aab9c34571a0c3585869ae9bdbc975bb92/movie_600x337.jpg |
| screenshot_full | 257256709/0629a6aab9c34571a0c3585869ae9bdbc975bb92/movie_full.jpg |
| all_ages | true |
| is_highlight | true |
| timestamp | 7 August 2026 – 06:57:42 UTC |
