I think no one responded because it is not something you make it yourself.
If you're in desperate need and will satisfy with "kaki no tane" taste-alike, here is a recipe:
1. Cut "mochi" into bits (similar in size to taki-no-tane). Dry in the sun for a couple of days. Next, roast, stirring slowly in Teflon pan.
2. When crackers become slightly brown, turn off heat and add liquid consisting of soy sauce, mirin and chii powder. Stir crackers until nearly dry.
3. Place on dry paper (such as newspaper) until completely dry. (You may add more chili powder at this point if you prefer it hotter.)
This is not the real thing but close. Amount of liquid depends on the amount of mochi--you have to test it yourself and decide.
Please note this is a recipe I found on the Web. I don't make kaki-no-tane myself.
If you don't have mochi, you'll have to start from steaming and pounding "mochi-rice"!
Anyway, hope it helps!
