One year earlier, Sagiri Izumi entered a step‑family with Masamune Izumi. The abrupt loss of their parents shattered the new household, leaving Sagiri isolated as a shut‑in and cutting her off from both brother and society. While tending to the remnants of their kin, Masamune supports himself as a published light‑novel writer, yet he faces one dilemma: he has never met his celebrated illustrator, Eromanga‑sensei, famed for producing the most explicit erotica. An awkward series of mishaps reveals that his own younger sister had been his collaborator all along! As fresh characters and obstacles emerge, Masamune and Sagiri must confront the light‑novel world together. Eromanga‑sensei chronicles their evolving bond and shared pursuit of success, while Sagiri gradually breaks free from her cocoon—how long can she conceal her true self from the world? Their journey is marked by unexpected twists that test their resolve and deepen the trust between them in time.
