The Ring has Disappeared - S1.E8

While looking for her ring, Karin runs into a small boy, Suzune, who is looking for his mother. Together they get trapped in the past because of the door of chaos. Suzune gives Karin a ring which was given to him by his mother to use against the door. Karin could not control the power of the ring but they were rescued by two strangers. When Karin awakes, she is in the present and dismisses the previous events as a dream.