A Cool Girl and a 12cm Promise

['Cool Girl and a Promise of 12cm', '12cm Promise With a Cool Girl', 'Kakkoii Onnanoko to 12-centi no Yakusoku', 'カッコいい女の子と12センチの約束', 'Promise of 12cm with Cool Girl', 'A Story About Becoming Cooler than the Cool Girl (Serialization)', 'Kakkoi Onnanoko to 12 cm no Yakusoku']