Mochizuke Nao is a high school student living in the present day. One day she goes to a nearby shrine for the summer festival… and somehow gets thrown back in time. When she opens her eyes, she finds herself in an unfamiliar land. A peculiar scenery lies before her eyes. It appears that she experienced a time slip back into a period of intense upheaval—the Edo period. The town she landed in is really different from the present day. Nao is incredibly shocked and troubled.