tgp_restore_japanese_government_decision_effect

tgp_restore_japanese_government_decision_effect = {
	japan_clear_flavour_flags_effect = yes
	save_scope_as = kampaku
	save_scope_as = background_throne_room_scope
	add_character_flag = tgp_japan_restore_japanese_government_flag
	# Change government if relevant
	change_government = japan_administrative_government
	if = {
		limit = {
			NOT = { has_realm_law = japanese_regency_succession_law }
		}
		add_realm_law_skip_effects = japanese_regency_succession_law
	}
	# Inform vassals and convert governments if relevant
	every_vassal = {
		custom = every_japan_feudal_vassal_custom
		limit = { government_has_flag = government_is_japan_feudal }
		add_opinion = {
			target = scope:kampaku
			modifier = restored_ritsuryo_opinion
		}
	}
	if = {
		limit = { NOT = { exists = scope:vassal } }
		custom_tooltip = tgp_japan_restore_japanese_government_decision_civil_war_tt
	}
	hidden_effect = {
		ordered_powerful_vassal = {
			limit = {
				is_ai = yes
				NOR = {
					government_has_mechanic = administrative
					is_allied_to = scope:kampaku
				}
				opinion = {
					target = scope:kampaku
					value < 25
				}
				save_temporary_scope_as = vassal_temp
				NOT = {
					scope:kampaku = { has_usable_hook = scope:vassal_temp }
				}
			}
			order_by = military_power
			save_scope_as = rebel
		}
		if = {
			limit = {
				NOT = { exists = scope:rebel }
			}
			ordered_vassal = {
				limit = {
					is_ai = yes
					NOT = { government_has_mechanic = administrative }
					opinion = {
						target = scope:kampaku
						value < 25
					}
					save_temporary_scope_as = vassal_temp
					NOT = {
						scope:kampaku = { has_usable_hook = scope:vassal_temp }
					}
				}
				order_by = military_power
				save_scope_as = rebel
			}
		}
		if = {
			limit = { exists = scope:rebel }
			tgp_restore_ritsuryo_civil_war_effect = {
				REBEL = scope:rebel
				LIEGE = scope:kampaku
			}
		}
	}
	custom_tooltip = {
		text = tgp_japan_restore_japanese_government_decision_vassal_tt
		every_vassal_or_below = {
			limit = {
				primary_title.tier >= tier_county
				culture = { has_same_culture_heritage = scope:kampaku.culture }
			}
			trigger_event = {
				id = tgp_japan_decision.9912
				delayed = yes
			}
		}
	}
	remove_character_flag = tgp_japan_restore_japanese_government_flag
}

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