(translated as The Progression of a Mother and Her Son in His Childhood Room Over 10 Years, and Beyond ) is a visual novel and adult media title developed by Gekkan Toshiue Milk Tank .

: The story spans ten years, tracing Hiroto's life from his youth to his current state as a 30-year-old recluse.

: Hiroto is depicted as an introvert who, despite attending school during his elementary years, eventually withdrew into the isolation of his family home.

: These individuals are often characterized by three conditions: being single, living with parents, and being middle-aged. While sometimes mocked, the phenomenon is also linked to parental psychology—where parents may leave a child's room "comfortable" because they fear isolation after the child leaves. Media Availability

The title was released on . It is primarily available for purchase through digital platforms like DLsite under the ID RJ320184.

: It delves into the specific events and psychological shifts that led to the "secret bond" between mother and son. Social Context: The "Kodomobeya Oji-san" Phenomenon