Eternal Cocoon is a horror adventure game where Olivia, a girl trapped between reality and dreams, must uncover the truth while evading threats and monstrous attacks to choose her own fate. After encountering a dark shadow, Olivia starts to sense that something is amiss in her life and begins to uncover the secrets of the mansion. Along the way, she pieces together clues and begins to realize the truth about her life. Inside the mansion, various traps and dangerous monsters threaten Olivia’s survival. As Olivia draws closer to the truth, what fate awaits her? Choices made at crucial moments and obtaining key items will impact the outcome.