Theatre of Darkness: Yamishibai (2013)

S05E04 Copycat

Two girls have shared their lives since they were young, bound by an unbreakable bond. Yukari has always admired her best friend Haru, often mirroring her actions and choices. It's uncertain whether this stems from jealousy, affection, or something more unsettling, but Yukari's intense emotions gradually morph into a consuming darkness, ultimately steering them toward a heartbreaking destiny.