Kiru Platina:  Majo no Dress* (着るプラチナ　 魔女のドレス)

Akita Shoten (秋田書店):  Bonita Comics (ボニータコミックス)
Shinsho-ban (新書版)

v.1:  ISBN:978-4-253-26341-2, 11/2015

• 秋田： 着るプラチナ 〜魔女のドレス〜 第1巻

This volume contained the first five stories of the series.  Akita Shoten also released an electronic version.

Kiru Platina:  Majo no Dress* (着るプラチナ　 魔女のドレス)

Amazon.co.jp
Shinsho-ban (新書版)

v.2:  ISBN:978-4-9909580-0-8, 06/2017

This volume was self-published by the author through Amazon.co.jp and contained eight further stories to complete the series.  It was also released in a Kindle edition, of course.