Japanese Modern Living Style (Two-world house1)

Two families are living in the upper and under world. The upper family seems to live in a Japanese modernized era, on the other hand, the family on the other dimension seems to live in a Japanese classic era. Both of the dimensions represent the Japanese housing style of architecture in each era at the same time. The two families would never be able to interact with each other, however they live closely and feel togetherness in different time.