Kaiya Mito, a high school student, is currently in a relationship with the young entrepreneur Sakaki Yuma. Frustrated, Mito makes a bold statement, threatening to be unfaithful to the seemingly indifferent Yuma. Shockingly, Yuma is unaffected by the threat and even encourages Mito to pursue it. During their vacation in Hawaii, Mito decides to act on his threat, but even while he's with another person, Yuma continues to consume his thoughts. The reason behind Yuma's stoic behavior remains a mystery in this captivating love story filled with adventure.
