I'm Inlove With A Ghost (On going)

Akiyama family moved in Tokyo from Osaka
When Kiyomi Akiyama was in the school . She saw something on her notebook
Someone needs help.
His name is Hiroshi He needs help. He need to gave the letter
To her sister so that he could live in the human world again.
But there's a problem!!

MOMOI IS NOT IN JAPAN!!!

Will Kiyomi help him? will they succeed or Hiroshi will be a ghost forever?