A book exploring the mindset useful for business. - Title: Have an Unbreakable Sword in Your Heart - Author: Janguria Okinawa - Genre: Business & Economics - ISBN: 9784478182174 - Price: 1300 yen (excluding tax) Thank you for viewing. This is the intense and true story of how the strongest marketer, Takeshi Morioka, opened the now-talked-about Janguria Okinawa.