Introducing the Yomota clan: Kinekuni (42), Tamiko (38), and their bonded son, Inumaru (17). They exemplify the model of a closely-knit family. Yet, their serenity is disrupted when an astonishing, youthful lady shows up at their doorstep. This woman declares herself as Inumaru's granddaughter from the future- "Maroko Yomota." Although Tamiko is hesitant at first, Kinekuni and Inumaru embrace their newfound kin. However, their tranquil home atmosphere begins to unravel.