Masamune Izumi is a high school student also working as a light novel author. He works with a mysterious illustrator who draws really erotic art for his light novels. In the midst of trying to deal with school and his shut-in sister, he discovers the identity behind this Eromanga-sensei!

Gran dreams of his youth, remembering the words his father left in a letter - "I will be waiting at Estalucia, Island of the Astrals." He awakens to find Lyria at his bedside, happy to see him well after the incident with Pommern and the Hydra. Katalina and Lyria explain to Gran the situation he now finds himself in, and that he must now make the bold action to journey with them.

To Chibi Panda and Gao's dismay, Batzz shows no interest in the World Buddy Masters. Worse still, his rampages cause city-wide blackouts. Chibi Panda learns the rules of Buddyfight, while Gaito and Abygale challenge Gao and Batzz to a match.