Attending a friend's wedding... During my vacation back home, I reunited with Ai, my childhood sweetheart whom I'd admired since we were young, after many years. We were both married and adults now, but Ai's smile remained unchanged, stirring my heart. As children, we made a secret promise... sneaking into Ai's house late at night for fireworks... As adults, we watched fireworks under the night sky, unable to be overwhelmed by their beauty...