Yuu Isshiki, a freshman in college, is in a relationship with the lovely Karen Mitsumoto. However, his world is shaken when he discovers Karen's involvement with her senior, Kamokura Tetsuya. Filled with a mix of anger and sorrow, Yuu reaches out to Kamokura's girlfriend, the renowned beauty of the school, Sakurajima Touko. Unexpectedly, Yuu pleads, 'Touko-senpai, please share an adventure with me.' But Touko, determined not to be deceived, reveals her intention to lead her adversary into despair. Her intricate scheme involves fostering affection only to shatter it under the cover of night with another.