Kakkoii Onnanoko to 12 Centimeter no Yakusoku

12cm Promise with a Cool Girl
カッコいい女の子と12センチの約束
A Story About Becoming Cooler Than the Cool Girl
Promise of 12cm with Cool Girl

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Synopsis

Tomoaki Kamba admired his boyish childhood friend, Ibuki Tachibana, and promised to become "more cool" than her. However, four years have passed, and Ibuki has grown up to be an even more handsome girl! Their relationship is as unchanged as a 12cm height difference that cannot be filled...? The curtain rises on a pure love story about a cool girl who is sorely in love with a boy who wants to be cool! (Source: Ichijinsha, translated)

Publication notes

Kakkoii Onnanoko to 12 Centimeter no Yakusoku is a web manga released on the author's Twitter and pixiv accounts from February 5, 2023, to July 23, 2023. Official serialization began in Ganma! on August 6, 2023. The series has been published digitally in English as 12cm Promise with a Cool Girl through Mangamo.