An amazing Japanese Koi T-shirt with various writings on it, explaining the significance of this mystical creature in Japanese culture. Here are the Japanese-English translations: On the top right it says (勇気: Yuuki) courage; bravery; and just below it says (肝試し) test of courage (e.g. At the very left it says (度胸を据える) to make up one’s mind; to prepare oneself for what is to come, and at the bottom it says (勇気を出す) to summon courage; to be brave.