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

Imagine Studio Ghibli meets Arkane’s Dishonored:

The threat posed by the Deep Sea Sisters has been mitigated. Agent Hasumi demonstrated exceptional skill in high-pressure environments. The technology recovered from the Sunken Spire suggests a lost civilization with advanced hydro-engineering capabilities. Future expeditions should proceed with caution regarding the dormant "Heart of the Current."

REPORT ENDS.

Act I – Descent
Hasumi accepts “Mission Mermaiden” after being promised answers about her sister’s disappearance. She descends to the Midnight Zone (2000m) and first encounters the Sisters — mistaking their defensive postures for aggression. Mission Mermaiden - Hasumi and the Deep Sea Sis...

Act II – Resonance
After a near‑fatal equipment failure, a young Sister named Lumina saves Hasumi. Through shared visions (triggered by a symbiotic kiss / pressure‑touch), Hasumi learns the Sisters hold her sister’s memories. The “enemy” is not the Sisters but the mining fleet above.

Act III – Uprising
Hasumi and the Sisters sabotage the mining operation using acoustic resonance (whale‑song cannons). Hasumi’s sister’s memory‑pearl is retrieved, revealing she chose to become part of the Sis collective. Hasumi stays as a surface liaison, renaming the mission “Guardian Mermaiden.”

The plot kicks off with a distress signal that is less of a sound and more of a psychic scream. The Deep Sea Sisters—three primordial entities who maintain the balance of the ocean—have fallen into a chaotic "Corrupted Resonance." This corruption turns the sisters against one another, causing tidal waves and monstrous sea creatures to surface, threatening coastal cities. Imagine Studio Ghibli meets Arkane’s Dishonored : The

Hasumi is chosen for the "Mermaiden Protocol" because of her unique resistance to psychological manipulation. Unlike other characters who would succumb to the Sisters’ sorrowful songs, Hasumi can wield her blade against the emotional weight of the ocean.

Phase 1: Descent Agent Hasumi infiltrated the "Abyssal Trench" following the disappearance of several reconnaissance drones. Initial telemetry indicated a massive thermal pocket and bioluminescent signatures inconsistent with standard marine life.

Phase 2: Contact At depth 4,500 meters, Hasumi made contact with hostiles identified as the Deep Sea Sisters. Phase 3: The Conflict The engagement escalated upon

Phase 3: The Conflict The engagement escalated upon Hasumi’s entry into the Sunken Spire. The Deep Sea Sisters deployed a "Siren Song" frequency intended to disable navigation systems. Hasumi countered by switching to manual visual targeting. The conflict resulted in the suppression of the hostiles' defensive perimeter, allowing Hasumi to secure the central chamber.

The title’s playful "Sis…" hides a tragedy. The fourth, unspoken sister—Umiko—was corrupted by the Black Tide centuries ago. Now a hollow siren, she hunts her own siblings, whispering:

"Why wake them, little mermaid? They left me in the dark."

Umiko isn’t a villain but a broken sister, and Hasumi’s true mission becomes one of healing, not destruction.