“There’s a rat in this house—” Masaki Ōsawa runs a small dental clinic in a quiet town, but he hides a dark secret: his eldest son, Shōta—once a bright boy who passed the entrance exam to a prestigious middle school and dreamed of becoming a doctor— has been shut in his room for seven long years. Masaki and his family have long ignored the problem with empty reassurances like “someday…” or “he’ll come around…”. But when his daughter’s arranged marriage is brought up, the fragile balance in the household begins to crumble. A powerful story of family despair and rebirth, set in an age where over a million people live as shut-ins—now brought to life in comic form.