Tsukasa Domyoji (Jun Matsumoto) and Tsukushi Makino (Mao Inoue) face a challenge when a precious tiara gifted by Tsukasa's mother is stolen just after their engagement. Determined to recover the stolen treasure, they embark on an international chase from Las Vegas to Hong Kong, enlisting the help of their F4 friends Rui Hanazawa (Shun Oguri), Sojiro Nishikado (Shota Matsuda), and Akira Mimasaka (Tsuyoshi Abe). As they track the tiara through multiple locations, the stakes grow higher with their future happiness hanging in the balance. Will they successfully retrieve the symbolic token of their love before their wedding, or will the theft derail their happily ever after? This is a 2008 Japanese romance film based on the manga series by Yoko Kamio, directed by Yasuharu Ishii.