@person22 chapter 13 is 2 extras in 1 chapter, and because people get confused, the to be continued in "october" issue from chapter 12 refer to the 2 extras, aka chapter 13
here the 2 tweets by the artist, one for chapters 12 saying that is the end of the main story and next month the finale with the 2 extras, and the other tweet when the extras got released saying that is the final story (chapter 12 got released at end of july and the extras at end of august)
https://twitter.com/yuzuanko_/status/1154393717177929729
https://twitter.com/yuzuanko_/status/1165644878690209798