Things are blowing up in more than one sense when Yuto works up the nerve to ask Natsumi to watch the fireworks with him! Later, Kazama and Sakurai bond over a snowball fight, Futaba's Christmas plans get derailed by champagne, and Takeda and Futaba begin coaxing Momiji out of her shell. This volume also includes and all-new story from Natsumi and Futaba's school days where we learn Natsumi's surprising, bittersweet secret.