Summary

Chapter 3, “The Sisters,” opens in the present day. A teenage girl is sitting in the time travel chair in the café. The café’s owner, Nagare Tokita, realizes that she is someone from the future who has traveled back in time. Nagare greets the girl and asks why she has traveled through time. The girl refuses to say. However, when Kei arrives at the café, the girl asks to take a photo with Kei. Kei is confused, but she agrees. After the photo, Kei asks why the girl wanted a picture with her, but the girl vanishes from the seat, back to her own time. The Nagare, Kei, and Kazu wonder who the girl was. The narration then briefly elaborates on the rule that time travel to the past cannot change the present. Specifically, if someone goes to the past and changes something, then...