Question: Which American author wrote both The Idylls of the Queen, and the "Frostflower and Thorn" series?
Sentence (from "Myōjin Yahiko"): The character of Yahiko is based on the author's childhood experiences practicing kendo; since Watsuki's experienced frustration during kendo classes, the author wrote Yahiko as experiencing frustration with his kendo skills.
Relevant evidence: No