According to Kadokawa, an OVA of R-15 will be bundled with the tenth volume of the novel.

R-15 is about a boy, Taketo Akutagawa, who attends a school for geniuses: Inspiration Academy Private High School. Taketo is a genius novelist and writes erotica. Despite negative perceptions many people have of him, he aims to be at the top of his class and be recognized as the world's greatest writer.

Life at the Rainy Color café can never be described as boring. The arrival of the Koga brothers from England—Noel, always brimming with curiosity, and Nicola, somewhat shy and conservative—ensures that their sibling, café manager Shion, is kept on his toes. There's also another newcomer, cameraman/photographer Jun Arisawa, who holds a mysterious connection to café owner Koji Amami. Last but not least, there's a special photograph that incites all kinds of heartfelt and comedic reactions from the Rainy Color crew!

Headmasters starts with Galvatron leading a new batch of Destrons to wage war on Cybertron, the Destron Headmasters. The Cybertrons are rescued by the arrival of the Cybertron Headmasters, led by Fortress (Cerebros, the head of Fortress Maximus). It is revealed that Fortress Maximus left Cybertron millions of years ago in search of energy, and have finally managed to come home. He explains that the Headmasters are from a planet called Master; the human-sized robots who live there built themselves Transformers-sized bodies. They can then transform themselves into the heads of the robots, and have now joined the Cybertron-Destron war.