the day your dream comes trueA phrase referring to the future day when someone's dream becomes a reality. 君の means “your,” 夢 means “dream,” 実現する means “come true” or “be realized,” and 日 means “day.”
JA: 君の夢が実現する日を楽しみにしているよ。
EN: I'm looking forward to the day your dream comes true.