Players control Hasumi , a operative sent into a dangerous environment RAWG.
The game was initially released for Windows on , with a Mac version that was later taken down on October 15, 2025. The official Japanese title is ミッションマーメイデン -ハスミと深海の姉妹 , which directly translates to Mission Mermaiden: Hasumi and the Deep Sea Sisters .
In the context of this game, a "verified" version often refers to mods or builds that have been cleared of bugs and optimized for modern PCs. Content creators on platforms like YouTube frequently showcase "Stage 1" gameplay to help new players navigate the initial difficulty spike. Where to Find It
The game originally debuted on July 27, 2020 RAWG.
Hasumi serves as a bridge between the surface-level mermaids and the mysterious entities that live in the depths. The Deep Sea Sists: A "Verified" Mystery
She thought about the Sist’s final, desperate question: Are you real?
The official, verified version of the game is hosted on the Japanese digital marketplace DLsite Maniax under the product tracking ID RJ268920 RAWG.
But not a song of harmony. A song of doubt .
While these community versions significantly improve the game, some players have noted that the lack of new tutorials for certain mechanics can make them difficult for newcomers to master. Mission Mermaiden - The Downfall of Hasumi by NoGag
: Players can cross-reference the game's release details, platforms, and genre tags using the verified title entry on the open gaming database RAWG .








