かみかみかえし

For thirteen years, Mashiro has lived confined to a single room, her only glimpses of the outside world coming through books and a narrow window. Descended from a lineage of priestesses who shelter gods and goddesses in their hair to offer them rest, Mashiro is seen as a precious tool by her family. But when she finally dares to step beyond her room, everything changes—from her appearance to her beliefs. As she encounters the gods sealed within her hair, including the fiery Hinokagu, Mashiro begins to unravel the mysteries of her heritage and the power of the ritual known as "Kamikamikaeshi." (Unreviewed summary by Grok 2)