In 'Headcase: Who's Hello Anyway?', you play as an amateur detective who discovers a mysterious set of journals in an abandoned library. The journals belong to several characters, each with fragmented memories and shocking secrets. As you navigate through their distorted perspectives, you must piece together a dark conspiracy that threads through their lives, questioning everything from your own sanity to the reliability of memory itself. Choices you make alter not only the plot but also your character's mental state, leading to multiple endings that challenge your understanding of reality and truth.