"The First String Theory: Unraveling the Mysteries of the Universe, Forces, and Time" Hikaru Kawai Price: ¥800 Thank you for viewing this product! This book is from the first edition in 2005, so it's a bit old, but it explores the birth of the universe, the nature of time, and gravity through quantum mechanics and particle physics. Since it's been some time since its publication, I think you can still enjoy it by comparing it to recent research findings! If you have any questions, please feel free to contact me!