Intro. The shackles of the "contract" led her to embark on this unknown journey. Sachiko Eida, a year burdened with a break with her family, but with a trace of innocence not polluted by the world, came to this strange bustling city alone. Her eyes were clear, as if she could still see the beauty of the world, although her past experiences had made her taste the bitterness of being deceived many times. However, the kindness of the heart never gave in. Beneath her docile and quiet exterior, there is an indescribable attraction that inadvertently tugs at the heartstrings of onlookers. When night falls, she will take out the worn music box and let the out-of-tune melody flow in the silence, and her thoughts drift into the distance, is it a memory, or is it an expectation of the future?