"Open! Door of Dimensions!" The seven peaceful parallel worlds are thrown into danger by the appearance of a new villain, 'Another'. To stop Another, who is defying the order of the parallel worlds, the Dimension Goblin 'Kibi' asks for help from 'Hari' and 'Shinbi'. Through Kibi, Hari learns that another seven worlds exist, and that people with the exact same appearances and names as herself live there. She also hears that her suddenly missing younger siblings, 'Duri' and 'Geumbi', have fallen into Another's world. To find her siblings! To save the parallel worlds! Hari embarks on an adventure to the Seventh World, where the key of last hope lies!