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...
"Hyena Department" name 
and seriously hunts every bit down...
...قسم الضّبع" ويبحث عن كلّ تفصيل"
"Dipartimento delle Iene" 
e scoverà ogni singola minuscola briciola...
e realmente caçar tudo...