Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card is used to Ritual Summon "Divine Grace - Northwemko". You must also Tribute monsters whose total Levels equal 7 or more from the field or your hand. During your Main Phase, you can remove from play this card from your Graveyard to make 1 face-up Ritual Monster you control become un-targetable by effects this turn.
--救世の儀式
--Ritual of Grace
local s,id=GetID()
function s.initial_effect(c)
	Ritual.AddProcGreaterCode(c,7,nil,61757117)
	--untargetable
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetRange(LOCATION_GRAVE)
	e1:SetCost(Cost.SelfBanish)
	e1:SetTarget(s.uttg)
	e1:SetOperation(s.utop)
	c:RegisterEffect(e1)
end
function s.filter(c)
	return c:IsFaceup() and c:IsType(TYPE_RITUAL)
end
function s.uttg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
end
function s.utop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsFaceup() and tc:IsRelateToEffect(e) then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_CANNOT_BE_EFFECT_TARGET)
		e1:SetValue(1)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		tc:RegisterEffect(e1)
	end
end