Mission Mermaiden ~Hasumi and the Deep Sea Sisters~ is an adult action-platformer (eroge) released in 2020 by developer (or Mizunashitei ) . Set in a post-apocalyptic future, it follows a female protagonist battling alien life forms. Game Overview Genre: Action, Side-scroller, Platformer. Rating: 18+ (NSFW/Adult content). Release Date: July 27, 2020. Platform: PC. Plot & Setting
The game features intense boss fights against massive alien-aquatic hybrids. For example, early gameplay showcases highlight battles such as Hasumi vs Tentacle Jellyfish on YouTube , requiring players to memorize attack patterns, dodge sweeping tentacles, and exploit elemental weaknesses.
The title is categorized within the "eroge" or adult game genre, featuring themes such as bondage and corruption. It has also seen significant community attention through modifications, such as the Downfall of Hasumi mod, which reworks enemy AI, movement patterns, and the resource management system to provide a more challenging experience. Mission Mermaiden - The Downfall of Hasumi by NoGag Mission Mermaiden - Hasumi and the Deep Sea Sis...
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Hasumi isn't just an explorer; she is a link between the surface world and the forgotten "Deep Sea Sisters"—ancient entities or guardians (depending on your interpretation of the lore) who hold the key to an impending ecological or magical crisis. Character Spotlight: Who is Hasumi? Mission Mermaiden ~Hasumi and the Deep Sea Sisters~
At its core, "Mission Mermaiden - Hasumi and the Deep Sea Sisterhood" is a story about friendship, courage, and the responsibility to protect our environment. Hasumi's journey is not just a personal quest but a mission to save her sisterhood and the ocean from those who would seek to harm them. Along the way, she learns valuable lessons about leadership, the importance of community, and the interconnectedness of all living beings.
It was not a request but an invitation threaded with urgency. The sisters spoke of three tasks — three currents to mend — each requiring a different kind of courage. Rating: 18+ (NSFW/Adult content)
: The primary backdrop is the treacherous, overgrown Karimantan Jungle . This environment is filled with both environmental hazards and remnants of alien forces.