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.