Mission Mermaiden - Hasumi And The Deep Sea Sis... Today

Players navigate alien-infested environments, engaging in combat with approximately 12 distinct enemy types and six unique boss fights.

is a 2D side-scrolling action platformer that blends sci-fi exploration with retro-inspired visuals . Set in the year 2101 AD, the game follows a "badass heroine" named Hasumi who is dispatched to the Karimantan Jungle on a distant planet. Her mission is to investigate rumors of a biological weapon and confront the "Deep Sea Sisters," a group of android-like adversaries attempting to thwart her progress using a variety of mental and physical traps. Gameplay and Visual Style Mission Mermaiden - Hasumi and the Deep Sea Sis...

Some players have noted that character animations can feel slightly "janky" or stiff, though the overall production value is considered high for its genre. The "Downfall of Hasumi" Mod Her mission is to investigate rumors of a

A popular modification titled by creator NoGag significantly overhauls the base experience. This mod, available on platforms like Itch.io , replaces the standard health system with a Willpower system . It introduces meters for "Pleasure" and "Corruption," turning the game into a more complex survival-style experience where the enemies focus on manipulating the protagonist's mental state through hypnosis and experimental devices. Summary of Key Features Protagonist Hasumi, a special operative Antagonists The Deep Sea Sisters and their alien minions Setting Karimantan Jungle, Year 2101 AD Platform PC (often found on doujin or indie game sites) Developer Hakkaku (Hat caku) This mod, available on platforms like Itch