The arcane arrival of a broken message sends Ginko to visit the source, a sad remnant barely clinging to life and desperate hope. Years before, two children were sent away so that one must not live alone. Apprenticed to an ancient master, an accident conspired to separate the sisters, leaving one confined within, the other to waste without. Ginko must use the mushi, taking the girl to explore an ancient pathway between hollow worlds, in order to silence a fool’s errand. But hope will live eternal.