During a casual walk, high school student Touru unexpectedly encounters his classmate Ayabe Reri, the school's beloved idol known for her beauty and quiet demeanor. To his surprise, Touru witnesses Ayabe engaging in a daring activity, prompting a mysterious request for secrecy the following day. As these two contrasting personalities navigate this newfound secret, their unlikely relationship is poised to unravel in unpredictable ways.