Unaired anime episode bundled with the limited edition of High School DxD DX.2.

The people of the kingdom look down on the young Prince Bojji, who can neither hear nor speak. They call him "The Useless Prince" while jeering at his supposed foolishness. However, while Bojji may not be physically strong, he is certainly not weak of heart. When a chance encounter with a shadow creature should have left him traumatized, it instead makes him believe that he has found a friend amidst those who only choose to notice his shortcomings. He starts meeting with Kage, the shadow, regularly, to the point where even the otherwise abrasive creature begins to warm up to him. Kage and Bojji's unlikely friendship lays the budding foundations of the prince's journey, one where he intends to conquer his fears and insecurities. Despite the constant ridicule he faces, Bojji resolves to fulfill his desire of becoming the best king he can be.

The aloof high schooler Mo Fan has found himself in a universe similar yet distinctly different from his own mundane one; it's a place where magic has replaced the essence of science. Here, the most capable students are taught to master the wonders of spellworking to fend off large devastating beasts that lurk in the forests surrounding the city. Like his previous life, Mo Fan remains the son of a poor laborer and the older step-brother to a crippled sister. Despite these disadvantages, he dreams of attending a magic school to become a magician—a highly respected and lucrative trade—in order to repay his father for his hard work. Mo Fan is accepted into a renowned magic institution. However, rumors spread about his poverty and lack of magical ability, labeling him as the laughing stock of the school. Nonetheless, Mo Fan manages to harness not only the powerful fire element, but also the rare lightning element! Now armed with dual abilities, what dangerous encounters will the versatile mage face? [Written by MAL Rewrite]

Sentan Island is a small island surrounded by the Yuden Sea. It exists in a state of dreamlike tranquility, cut off from the war between the Northern Government and the Southern Continent Free Zone. Our hero, Akiyuki Takehara, lives on Sentain Island along with his mother Fusa. He is currently separated from his father, the town doctor Ryuzo, but the bond between father and son remains. One day, after taking Ryuzo the lunch that Fusa has made for him as usual, Akiyuki arrives at school, where he is caught up in an explosion along with his friends, Haru and Furuichi. The explosion produces a mysterious light, which enters Akiyuki's arm, causing him excruciating pain. He's given no time to understand it, however, as the white-haired girl who rode on the bus with him guides him to a power unlike anything he's ever known.