Mukotorikon (å©¿åÂÂå© ãÂÂãÂÂã¨ãÂÂãÂÂãÂÂï¼Ârefers to a system of uxorilocal marital structure in Japan, particularly in Japan's medieval period which was largely superseded by a system of patrilocal marriage, as some men became in charge of units ie or za following changes in society such as the decline of the ritsuryo system.