[Ron Unagi] Kawamono no Hi | Skinsuit Day

When Karen returns home, she expects a warm welcome from her older sister, Misuzu. However, a strange transformation is underway as Misuzu's physical form begins to change, leading to a startling realization about the true nature of their relationship. As the boundaries between sister and skin suit blur, Karen finds herself unable to resist the overwhelming sensations of this new, unexpected reality. Is this a temporary change, or is the person she knows being replaced forever?