After learning he possesses the mystical Sekiken sword, Touka Kamiazuma inherits the responsibility of safeguarding Kamitsumihara. His bond with the land strengthens upon encountering the enigmatic Momoka Kawakabe. Bound by an irresistible force, Touka and Momoka are entwined in a tapestry of hidden truths and age-old sorrows, destined to revive a legendary tale and reshape Kamitsumihara's destiny.