SONE-101 delves into delicate themes of uncontrolled desire within a familial setup. The story orbits around Miru’s character, a married woman whose life takes an unexpected turn when her husband’s younger brother starts to exhibit uncontrollable sexual desires towards her. The younger brother commences to act on these desires while pretending that she’s asleep. Despite the abrupt and dangerous nature of these advances, Miru’s character finds herself conflicted due to her sexually deprived state, which leads her to respond with a mix of reluctance and acquiescence.