TCG Rulings

• This effect targets 1 face-up Equip Spell Card you control. ^[1]

• All cards destroyed by "Release Restraint Wave" are destroyed at the same time.^[1]

• You may target an Equip Spell Card you control that cannot be destroyed such as "Fusion Sword Murasame Blade" or an Equip Spell Card with a counter from "Magic Reflector". If you do, the "Equip Spell Card" is not destroyed but Set Spell or Trap Cards your opponent controls are destroyed.^[1]

• If the Equip Spell Card targeted by this effect is not on the field when the effect resolves, your opponent's Set Spell or Trap Cards will not be destroyed.^[1]

• You cannot activate this card if your opponent doesn't have any Set Spell or Trap Cards.^[1]

OCG Rulings

• The effect of "Release Restraint Wave" targets one face-up Equip Spell Card you control.^[2]

• All Spell and Trap Cards destroyed by "Release Restraint Wave" are considered to be destroyed simultaneously.^[2]

• "Release Restraint Wave" cannot be activated if the opponent does not control any Set Spell or Trap Cards.^[3]

• You can activate "Release Restraint Wave" and target "Fusion Sword Murasame Blade". When resolving "Release Restraint Wave", all your opponent's Set Spell and Trap Cards will still be destroyed, even though "Fusion Sword Murasame Blade" cannot be destroyed.^[4]

References

1. ↑ ^{1.0 1.1 1.2 1.3 1.4} Shriek TCG: Ancient Prophecy - Rulings
2. ↑ ^{2.0 2.1} Konami FAQ: Spell Card > Release Restraint Wave
3. ↑ Konami FAQ: Can "Release Restraint Wave" be activated when the opponent does not control any Set Spell or Trap Cards?
4. ↑ Konami FAQ: Is the effect of "Release Restraint Wave" applied when "Fusion Sword Murasame Blade" is targeted?