High schooler Takano Haruko has always been invisible, bullied, friendless, and hiding in the corners of her life. That is, until someone, steps in cheerful, kind, and interested in Haruko’s writing. With that person's guidance, Haruko finds friends for the first time and begins to feel safe. But safety can be deceptive. One seemingly ordinary invitation to a birthday party, leads Haruko into a quiet, lingering horror. As trust and kindness collide with an unknown darkness, Haruko begins to realize that not every smile hides warmth, and not every protector is what they seem.