Where can I buy corn kernel for making popcorn?
Yes is different from normal corn.  Gets hot with oil and small water inside makes corn pop.

http://global.rakuten.com/en/store/caramelcafe/item/p_cot1002food005/

Cost is ¥2,056 for 8 pound/3.63 Kilogram.  Will last very long time.

再见

[Please do not edit for clarity]