Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Activate this card by targeting 1 "Ninja" monster you control; it cannot be destroyed by battle. * The above text is unofficial and describes the card's functionality in the OCG.
--忍法 空蝉の術
--Ninjitsu Art of Decoy
local s,id=GetID()
function s.initial_effect(c)
	aux.AddPersistentProcedure(c,0,aux.FaceupFilter(Card.IsSetCard,SET_NINJA))
	--indes
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e1:SetRange(LOCATION_SZONE)
	e1:SetTargetRange(LOCATION_MZONE,LOCATION_MZONE)
	e1:SetTarget(aux.PersistentTargetFilter)
	e1:SetValue(1)
	c:RegisterEffect(e1)
end
s.listed_series={SET_NINJA}