美人魚之謎-蓮與深海姐妹 (Mission Mermaiden ~ Hasumi and the Deep Sea Sisters) is a 2020 action-adventure, action-platformer game developed by the indie studio 八角家 (Hakkaku-ya). As the third R18 title from this creator and the second featuring the protagonist Hasumi, this game serves as a follow-up to Tail Undercrust -Hasumi and the Last 7 Days- . It continues the story of Hasumi, a courageous soldier navigating a high-stakes, underwater sci-fi world, offering a unique blend of platforming challenges and narrative-driven exploration.
According to the in-game Codex (entry #SIST-0): mission mermaiden hasumi and the deep sea sist
The developers have never clarified. Theories include: According to the in-game Codex (entry #SIST-0): The
Following its release, the game garnered a dedicated cult following within indie gaming communities. Its popularity led to fan-made mods, derivative works like the spin-off/mod project The Downfall of Hasumi hosted on platforms like Itch.io, and let's-play archival videos across streaming platforms. While the developer officially announced that content updates for the base game have concluded, it remains a highly searched title for fans of retro adult platformers. they sing a single
“The Deep Sea Sist is a resonant consciousness born from the deaths of three previous Mermaiden units who dove into the Mariana Anomaly. They no longer possess individual identities. Instead, they sing a single, broken chord across 17 distinct frequencies. To hear the Sist is to forget why you breathe.”
For those interested in exploring the depths of this bio-punk adventure, the Mission Mermaiden Game Page on RAWG provides additional details, and players often use the AutoTranslator tool to experience the Japanese-language original in English. YouTube·Leonora's Debaucheryhttps://www.youtube.com
Have you played “Mission Mermaiden Hasumi and the Deep Sea Sist”? Did you choose Harmony or Severance? Share your thoughts in the comments below. And stay tuned for our next deep dive: “The Forbidden Geothermal Temple of Tsunamiko.”
美人魚之謎-蓮與深海姐妹 (Mission Mermaiden ~ Hasumi and the Deep Sea Sisters) is a 2020 action-adventure, action-platformer game developed by the indie studio 八角家 (Hakkaku-ya). As the third R18 title from this creator and the second featuring the protagonist Hasumi, this game serves as a follow-up to Tail Undercrust -Hasumi and the Last 7 Days- . It continues the story of Hasumi, a courageous soldier navigating a high-stakes, underwater sci-fi world, offering a unique blend of platforming challenges and narrative-driven exploration.
According to the in-game Codex (entry #SIST-0):
The developers have never clarified. Theories include:
Following its release, the game garnered a dedicated cult following within indie gaming communities. Its popularity led to fan-made mods, derivative works like the spin-off/mod project The Downfall of Hasumi hosted on platforms like Itch.io, and let's-play archival videos across streaming platforms. While the developer officially announced that content updates for the base game have concluded, it remains a highly searched title for fans of retro adult platformers.
“The Deep Sea Sist is a resonant consciousness born from the deaths of three previous Mermaiden units who dove into the Mariana Anomaly. They no longer possess individual identities. Instead, they sing a single, broken chord across 17 distinct frequencies. To hear the Sist is to forget why you breathe.”
For those interested in exploring the depths of this bio-punk adventure, the Mission Mermaiden Game Page on RAWG provides additional details, and players often use the AutoTranslator tool to experience the Japanese-language original in English. YouTube·Leonora's Debaucheryhttps://www.youtube.com
Have you played “Mission Mermaiden Hasumi and the Deep Sea Sist”? Did you choose Harmony or Severance? Share your thoughts in the comments below. And stay tuned for our next deep dive: “The Forbidden Geothermal Temple of Tsunamiko.”