Yureru which means shake in Japanese or could be interpreted as rock, sway, or shiver is a book about TK's personal life and his music philosophy. His upcoming book is especially surprising given Toru is not known to be much of a reader. Not only that TK chose to write his own life account instead of outsourcing it to someone else which would classify it as a biography. Instead you are getting an autobiography by TK who set off time to write this which obviously must have taken time away from his music-making.
Given that TK is known as a Japanese Rock maverick whether for his Rock band or his solo music this is unheard for him.TK's upcoming new book will be published by Kadokawa with a release date set for June 21, 2023.
Pre-orders are already open:
*International readers: Yureru by TK from Ling tosite sigure is in Japanese. In addition, you can buy from Tower Records Japan which can import for you through WorldShopping or Amazon Japan through their Amazon Global operations to get your copy of the book but you can go with Sendico or Hoyoyo if you want to be able to choose whatever online store you want especially when each store has different pre-order benefits*
For more TK content: Toru Kitajima TKPG fan forum