Hmm, Circumstances are good, but there are a few problems here...
A) This seems more like a good solo thread than an actual Kidou app, this will still count as a solo thread if you wish... but you will need an kidou app that deals primarly with learning the kidou...
B) Ways to lengthen a Kidou app,
Make a background, A city will have more things to describe than the desert... The shinigami academy would have a dojo, a target field and a dummy field that you could describe...
Let the kidou fail, Its ok to let a kidou fail a few times or even slip up during the name, but trying the kidou and failing multiple times helps, or even improving the accuraccy of a spell helps...
Circumstances, you can put a circumstance that you are focusing on using the kidou or the kidou is needed so you must learn it but you also must focus on the kidou paticularly...