The Irregular at Magic High School Novel Volume 25 is written by Tsutomu Satou with illustrations by Kana Ishida.

After an attack by one of the Thirteen Apostles, Tatsuya and Miyuki have narrowly escaped unscathed. However, Minami teeters on the edge of death, much like Honami, who protected Tatsuya at the cost of her life. Meanwhile, Minoru seeks the forbidden power of the parasites to fulfill his desire to protect what's dear to him and more. Will his choice shake the foundations of the future? And what will happen when he and Tatsuya finally clash?