I have tried some question and answer about Kendo- not those particular questions. He finds that really hard- so easy to get to a word he doesn't know. The problem is not one of does he find the topic interesting- we are doing plenty of interesting topics. Rather that after one hour of lesson, he finds the English too much to handle. Hence if I did some Kendo related content at the end of the lesson then it would probably be one word answers filling in a worksheet and then we do the sentences together with him reading or repeating after me.
"Bring a fude, ink stone, ink-grinding stone, and Japanese writing paper to class"- don't have those myself.
"Class"- teach him one to one in his home.

English Teacher