Sayonara, Koharu-chan!?. Elza tells Koharu that the Venus Ark will be leaving Japan for a tour. Meanwhile, Yume, Rola, and Mahiru, whose exchange programmes aboard the Venus Ark are scheduled to end as a result, assume that they will end up having to part ways with Koharu once again, becoming worried when they can't find her aboard the ship before it departs. Thankfully, Koharu decides to stay behind after being declared a graduate by Elza and re-enrolls in Yotsuboshi Academy with Yume and the others, although Kirara ends up missing her departure. Upon arriving back at Yotsuboshi Academy, where Alice has also enrolled as a student, Yume and Rola put on a performance to welcome Koharu back. As Kirara ends up having to stay with Ako until she can return to the Venus Ark, Koharu states that she wants to help Yume achieve her dream of becoming the brightest star so she can fulfill her own dream of creating that star's dress.