Seina Yamada has been waiting so long to return to his home, Earth.
But so much has changed; his sister is engaged to Kiriko's brother Kai,
and his parents' old store is now a huge mall.
Furthermore, he is to stay at Kiriko's mother's house...
the royal family's ships have all 
sorts of restraints put on them.
سُفُن العائلة الملكيّة لديها مُختلَف أنواع القيود
as naves da família real têm todo
o tipo de restrição aplicadas nelas.