If this card is Normal or Special Summoned: You can add 1 "Dual Avatar" Trap from your Deck to your hand. During your opponent's turn, if a face-up "Dual Avatar" monster(s) you control, except "Dual Avatar Feet - Kokoku", is destroyed by battle or card effect: You can Special Summon this card from your hand, then you can apply this effect. - Destroy 1 "Dual Avatar" monster you control, and if you do, Special Summon 1 "Dual Avatar" Fusion Monster from your Extra Deck.
You can only use each effect of "Dual Avatar Feet - Kokoku" once per turn.
