Yui, a 17-year-old runaway, and Hiyori, an 8-year-old girl who lost her family and voice, meet the enigmatic Kiwa, an elderly woman who invites them to Mayoiga, a weathered house perched by the sea. Despite their spontaneous decision to stay with Kiwa, the girls find solace in Mayoiga's reputation as a sanctuary for lost souls and in Kiwa's unwavering kindness. As they reside in this legendary abode, known to embrace wandering travelers, both Yui and Hiyori slowly mend their broken spirits. However, their tranquility is disrupted when Kiwa's cryptic creatures, the 'Fushigitto,' unexpectedly appear around Mayoiga, stirring up a new wave of mystery and intrigue.