Twins Kouki and Nao Fujiyoshi harbor a forbidden love for each other, concealed by the taboo of their sibling bond. Their world shifts when their mother discloses Kouki's adoption, shattering the perceived familial tie. Adrift with newfound knowledge yet uncertain of each other's true emotions, the twins navigate uncharted territory. Embracing their altered reality, their relationship transforms, guiding them towards a deeper connection they had never dared to explore.