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

Since the event’s launch, the "Mission Mermaiden" tag has trended on Twitter and Reddit. Fans have praised the voice acting, specifically the moment when Hasumi whispers, "The sea is lonely, sisters... but you don't have to be," which triggers the final phase of the boss fight.

However, the biggest controversy revolves around a datamined secret. The "Fourth Sister" Theory: Players discovered a hidden audio file labeled "Sister_00_Leviathan." Many believe that the Void Leviathan (the secret boss) is actually the abandoned eldest sister, cast out for loving a human. This has led to petitions for a sequel event: "Mission Mermaiden 2: The Leviathan’s Lullaby." Mission Mermaiden - Hasumi and the Deep Sea Sis...

Hasumi learns she is a Mermaiden—a human with the soul of a mer-warden. Her mission: locate and awaken the Three Deep Sea Sisters, each guarding a fragment of the Ocean’s Heart: Since the event’s launch, the "Mission Mermaiden" tag

Logline:
In a coastal city drowning in silence, high school diver Hasumi discovers she is the last descendant of an ancient pact—tasked with awakening the Deep Sea Sisters, three mermaid warriors who protect the abyss from a rising corruption known as the Black Tide. However, the biggest controversy revolves around a datamined