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After another week of spending time with Alex and Gwendolyn, Frank decided to come back to Earth, especially to the Monk Clan.
He had been monitoring it for a while using a soul clone resembling something like a ghost, and as been helping the Oni get used to their new lives with the humans in the clan.
Of course, things were not easy at the beginning, but the help that Sadako, Kaguya, Matsuo, Sakura, and that one Oni named Uehara had done mad ethe Oni and the Humans a bit more trustful.
Definitely, more than just two weeks would be needed for them to get truly along, but they were working on it.