setup_japan_house_name_scopes_effect

setup_japan_house_name_scopes_effect = {
	save_scope_as = new_head
	save_scope_as = new_house_head # don't ask
	house ?= {
		save_scope_as = old_house
		house_head = { save_scope_as = old_head }
	}
	if = {
		limit = { domicile.domicile_location.county.holder ?= scope:new_head }
		domicile.domicile_location.barony = {
			save_scope_as = domicile_barony
			county = { save_scope_as = domicile_county }
		}
	}
	else_if = {
		limit = {
			is_landed = no
			scope:old_head.domicile.domicile_location.county.holder ?= scope:old_head
		}
		scope:old_head.domicile.domicile_location.barony = {
			save_scope_as = domicile_barony
			county = { save_scope_as = domicile_county }
		}
	}
	else_if = {
		limit = { is_landed = yes }
		save_scope_as = land_haver
	}
	else = {
		limit = { house.house_head ?= { is_landed = yes } }
		house.house_head = { save_scope_as = land_haver }
	}
	scope:land_haver.capital_county ?= {
		save_scope_as = primary_county
		random_county_province = {
			limit = {
				has_holding = yes
				NOT = { has_holding_type = church_holding }
			}
			alternative_limit = { has_holding = yes }
			barony = { save_scope_as = random_barony }
		}
	}
	if = {
		limit = { NOT = { exists = scope:random_barony } }
		location.barony = { save_scope_as = random_barony }
	}
}

As written in game/common/scripted_effects/10_dlc_tgp_japan_scripted_effects.txt.