Dachi no Imouto

When a close friend asks him to keep a watchful eye on his younger sister, the intention is simple: protect her from unsavory men and ensure she stays out of trouble. However, this seemingly straightforward favor quickly spirals out of control when an unexpected encounter changes everything. Instead of merely acting as a guardian, he finds himself struck by love at first sight, completely captivated by the very girl he was supposed to be watching over from a safe distance. What begins as a well-meaning promise soon transforms into a clandestine romance filled with sweet, undeniable immorality. Bound by loyalty to his friend yet driven by overwhelming desire, he enters into a secret relationship that thrills and terrifies him in equal measure. Every stolen moment together carries the heavy weight of potential betrayal, turning their hidden affection into a delicate balancing act between devotion and forbidden passion. As their feelings deepen, the path ahead grows increasingly treacherous. The inevitable truth threatens to shatter not only their fragile bond but also the trust of the friend who brought them together. Caught between genuine love and an impossible situation, they must navigate a complicated emotional landscape where every step forward risks devastating consequences for everyone involved.