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...
it also acts as the central 
core of her memory formation.
يؤدّي هذا أيضاً وظيفة النُّواة المركزيّة لتشكيل ذاكرتها
funge anche da nucleo 
della formazione della sua memoria.
Ele também age como núcleo central
da formação de memórias dela.
она ещё выполняет функции
центрального ядра её памяти.