Shizuku Hasegawa, a bright and cheerful girl raised in a warm family environment, may struggle with her studies, but she always faces life with optimism. Yet within the very family meant to support her growth, an unexpected darkness lies hidden. The story portrays how figures such as her parents and older brother begin to influence her development, gradually drawing her into a forbidden world. Tackling the taboo theme of incest, it unfolds quietly beneath the surface of everyday life. The heartbreaking transformation of Shizuku's pure heart, as it slowly becomes distorted, strikes deep at the soul. The shadow concealed within the family home creeps forward step by step, threatening to consume the young girl's life, forming the core of this haunting narrative.