MarudaSister follows the story of a younger sister with a well-endowed chest, exploring the complexities of familial relationships intertwined with themes of personal discovery and growth. Through a series of doujinshi and comic releases, the narrative delves into the dynamics between siblings and the aftermath of revealing such intimate details. As the tale unfolds, readers are invited to ponder what comes next in the lives of these characters, making it a captivating journey through love, family, and self-reflection.