Thank you for viewing. 15 Habits to Sharpen Your Brain by Setsu Tsukiyama Enhancing Memory, Focus, and Thinking Skills Over 500,000 copies sold!! There's a reason it keeps selling. Clears a fuzzy mind! I only flipped through it. After that, it was stored on the bookshelf. NHK Publishing Seikatsu Shinsho (Life New Books) Price: 700 yen Please understand that this is a personal inspection and has been stored at home. Thank you.