ECOTECH is a research organisation that investigates climate threats and mysteries. One day, a spine-chilling nursery rhyme—"The Melody of Waves"—begins to play within ECOTECH, with lyrics resembling a doomsday prophecy. In the midst of this turmoil, the CEO of ECOTECH arranges an internal meeting with some of the organisation’s key stakeholders. As the staff arrives at the conference room, they discover the CEO’s dead body.