I went back home during the Bon holiday to attend a friend's wedding, and for the first time in years I met my childhood friend Ai, who I've had a crush on since we were little. We've both grown up and married, but Ai's smile still makes my Kokoro beat faster. When we were little, we made a secret sign just between us... We sneaked into Ai's house and watched the fireworks at midnight... Now that we're adults, we're gazing at the fireworks under the night sky just like back then, and the fireworks alone can't contain us anymore...