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Synopsis
A girl receives a telegramme—"Your grandfather is gravely ill"; hops on the train and rushes to his home, opens the door and — the story begins. Ari and her ghost grandpa's home welcomes anyone, young and not-so-young, human and aliens alike. (Source: http://matt-thorn.com)
FAQ
So What? has 6 volumes.
So What? is currently finished.
So What? was written by Megumi Wakatsuki.
So What? was published Aug 1986 to Jul 1989.