In Jikken-hin Kazoku -Creatures Family Days-, Tanis is an ordinary human child, while his four older siblings were created as human / monster hybrids by their mad scientist parents.
The main staff and cast for Jikken-hin Kazoku -Creatures Family Days- have not been announced yet, although it is known that the opening theme, entitled “Early Days”, is performed by Rin Akatsuki.
The original Jikken-hin Kazoku -Creatures Family Days- will be serialized in Shinchosha’s Monthly Comic @Bunch seinen manga magazine beginning with the December 2017 issue, which will be published in Japan on October 21, 2017.