Mission Mermaiden Hasumi And The Deep Sea Sist Online

Hasumi, the youngest ever agent of the Oceanic Defense Corps (ODC), faces her first solo mission. The Deep Sea Sist—once guardians of the ocean’s memory—have fractured. One rogue Sist, Kaelen , has stolen the Coral Trident , an artifact that controls tidal currents. If unsolved, the surface world will drown in eternal storms. But Kaelen isn’t evil—she’s grieving. The Sist’s ancestral kelp library has been silenced by pollution. Hasumi must learn echolocation combat, resist the Sist’s hypnotic song, and broker a new covenant between the shallows and the abyss.

is an action-platformer developed by Hakkaku (八角家) that blends traditional side-scrolling mechanics with intricate status-management systems. Set in a futuristic, bio-organic world, the game follows the elite operative Hasumi as she navigates treacherous environments to stop a looming global threat. Plot and Setting mission mermaiden hasumi and the deep sea sist

: Hasumi is dispatched to the Karimantan Jungle to investigate rumors of a biological weapon. Hasumi, the youngest ever agent of the Oceanic

The world transitions from a lush, alien-infested to the sterile, claustrophobic hallways of a secret underground lab . The atmosphere leans into a mix of sci-fi horror and "fighting heroine" tropes, where the environment itself feels hostile to the protagonist. Quick Game Specs Developer: hakkaku (八角家). Platform: PC/Windows. If unsolved, the surface world will drown in eternal storms

is a grim one. Earth has been ravaged by an alien invasion, leaving the landscape unrecognizable. The protagonist,

Hasumi must investigate and confirm the existence of a rumored The Conflict:

The mermaids' code, as passed down through generations, is a set of principles that guide their actions and decisions. It is a code that emphasizes the importance of protecting the ocean and its inhabitants, and of living in harmony with the natural world. The code is as follows: