① The Art of Keigo for Capable People: 79 Secrets A book explaining how to use polite language useful in business situations. ・Supervised by: Akira Karasawa ・Published by: Nagaoka Shoten ・Price: ¥486 + tax ② 85 Rules for Speaking Easily in 10 Minutes, Even if You're Not Good at Talking ・Author: Yukio Matsumoto ・Published by: Seimi Bunko ・Price: ¥524 + tax ③ The Reason You Work ・Author: Masanobu Fukushima ・Published by: Chukei Publishing ・Price: ¥571 + tax ④ How to Think About Turning Adversity into a Positive ・Author: Shigeo Saito ・Published by: PHP Institute ・Price: ¥448 + tax All four books above are in almost new, excellent condition, but only ④ has some slight damage to the outer cover.