Akai Ito follows a simple idea, creating a picture with a single thread, and turns it into an engaging flow of animated images. Drawing from East Asian folklore, director Okushita adopts the symbol of the red string of fate, a myth in which the gods bind men and women destined to be each other's soulmates with an invisible red thread. This thread connects those meant to meet regardless of time, place, or circumstance; it may stretch or tangle, but it never breaks. The film is rooted in the ancient Chinese belief in the red string of fate.