This paper explores the narrative structure, character dynamics, and thematic elements present in the dōjin visual novel Furyouna Imouto No Shidou (Circle: Bitter & Sweet, DLsite ID: RJ01323679). By analyzing the work through the lens of the "imouto" (younger sister) archetype and the specific trope of "shidou" (guidance/coaching), this study aims to deconstruct how the title utilizes established genre conventions to deliver a focused character study. The paper examines the tension between the protagonist's authority and the heroine's perceived "delinquency," highlighting how the visual novel medium facilitates player immersion within this specific power dynamic. The dōjin soft market, particularly on platforms like DLsite, serves as a robust incubator for niche genre titles. Furyouna Imouto No Shidou (roughly translated as "The Guidance of the Delinquent Younger Sister") represents a specific sub-genre of visual novels focusing on sibling dynamics (simulated or blood-related) and corrective behavioral narratives. Nipple Slip Riya Sen