The Chapter 06 of the Middle School Series has been released on the 1st of February.
As a short note for this Wiki later on:
Chapter 01 - 13th Oct. 2017
Chapter 02 - 1st Nov. 2017
Chapter 03 - 1st Dec. 2017
Chapter 04 - 15th Dec. 2017
Chapter 05 - 15th Jan. 2018