Explore the captivating world of '夏休みの自由研究『婚約破棄観察日記』, a Japanese web novel that intricately weaves together the lives of siblings and childhood friends. The story revolves around a person's narrative about their brother and his childhood friend, whose engagement faces a sudden annulment by her fiancé. Filled with elements of drama and romance, this novel immerses readers in themes of broken engagements, European ambience, and heartwarming interactions, portraying a unique tale of villainess noble girls and the complexities of relationships.