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...
there's a bunch of social 
conventions and things...
...هناك مجموعة من الأعراف الاجتماعيّة والأشياء
ci sono un mucchio di convenzioni sociali...
tem um monte de
convenções sociais e tal...