Arayoshi Hatori (葉鳥新義, Hatori Arayoshi) was the Vice President of Marketing of the Yotsuba Group. Hatori is the illegitimate son of the company president and uses this fact to benefit himself. How to Read 13 states that he "appears to be something of a lightweight" and that he cannot handle the pressures of the meetings. After Hatori makes a careless outburst, he is killed by the Yotsuba Kira, Kyosuke Higuchi.
Hatori was married with children and a graduate of Futatsubashi University Literature department with an interest in ceramics.