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...
you might be used as a guinea pig 
for some experiment.
قد تُستخدَم كفأر تجارب لتجربة ما
würdest du sicher Opfer
ihrer Experimente werden.
tu finirais vite en cobaye.
potrebbe usarti come cavia 
per qualche esperimento.
pode acabar se transformando em
material para um experimento.