I noticed the first change in my mother the morning after she returned from buying groceries. She was usually light and cheerful, humming as she unpacked. That day she moved slower and avoided my eyes. When I asked if she was tired, she shrugged and said everything was fine, but there was a tightness around her mouth that didn’t belong. A week later, a small envelope appeared in our mailbox with no return address—a handwritten note enclosed with a few folded bills and a short message: “We can make things easier. Think of your daughter.” The handwriting was unmistakably Riku’s: neat, confident, the same looping letters he used on party invitations.