◯ wa × o Taisetsu ni Surubeki Darou?

Riko has reached a point in her life where her curiosity about physical intimacy can no longer be ignored. Having never experienced it before, she finds herself deeply preoccupied with the desire to understand what it truly means to cross that threshold for the first time. Rather than leaving such a significant milestone to chance or seeking out an unfamiliar partner, she begins to carefully consider who she trusts most in this world. The weight of wanting her first experience to feel safe and meaningful drives her toward a highly unconventional decision. Ultimately, Riko resolves to approach the one person she feels closest to: her own brother. She chooses him as the person to guide her through this uncharted territory, believing that their existing bond provides the necessary foundation of trust for something so deeply personal. This choice sets the stage for a delicate and intimate encounter, transforming their familiar sibling dynamic into something entirely new. As Riko prepares to navigate her very first sexual experience, the story explores the complex emotions and quiet vulnerability involved when she entrusts such a profound moment to the person she knows best.