If your opponent controls a monster and you control no monsters: Special Summon 1 "Gagaga" monster from your Deck. You cannot Special Summon any other monsters, except by Xyz Summon, during the turn you activate this card. You can only activate 1 "Gagaga Academy Emergency Network" per turn.
When your opponent activates a monster effect while you control a "Gagaga" monster: Negate the activation, then you can discard 1 card, and if you do, Special Summon 1 "Gagaga" monster from your Deck. You can banish this card from your GY; change as many "Gagaga" monsters you control as possible to Defense Position, and if you do, "Gagaga" monsters you control cannot be destroyed by battle or card effects this turn. You can only use each effect of "Gagaga Escape" once per turn.
If you control a "Gagaga" monster: Target 1 monster in your GY; Special Summon it, then you can make its Level/Rank become equal to the Level/Rank of 1 "Gagaga" monster you control. If this card is in your GY, except the turn it was sent there: You can banish it; immediately after this effect resolves, Normal Summon 1 "Gagaga" monster. You can only use each effect of "Gagaga Illusion" once per turn.
"Utopia" and "Utopic" Xyz Monsters you control whose original Attribute is LIGHT cannot be destroyed by card effects, also your opponent cannot target them with card effects. You can only use each of the following effects of "Gagaga Utopic Tactics" once per turn. You can declare a Level from 1 to 12, then target 2 face-up monsters you control, including a "Gagaga" monster; they become that Level. If you Xyz Summon a "Utopia" or "Utopic" Xyz Monster whose original Attribute is LIGHT: You can target 1 card your opponent controls; destroy it.
During the turn a "Gagaga" monster you control was destroyed by battle and sent to the Graveyard: Special Summon from your Graveyard as many monsters as possible that were destroyed by battle this turn, in face-up Defense Position, then take 600 damage for each monster Special Summoned by this effect. You can only activate 1 "Gagagaback" per turn.
If you control a "Gagaga" monster: Target 1 card on the field; destroy that target.
Banish 3 "Gagaga" monsters from your Graveyard; draw 2 cards.
If you control 2 or more face-up "Gagaga" monsters: This turn, monsters you control cannot be destroyed by battle or by card effects.
Target 1 "Gagaga" monster in your Graveyard; Special Summon it and equip it with this card. When this card leaves the field, destroy the equipped monster. When this card is sent to the Graveyard because the equipped monster was used as an Xyz Material: All Xyz Monsters you currently control gain 300 ATK.
When a face-up "Gagaga" monster(s) you control is targeted by the effect of an opponent's monster: Negate the effect of that opponent's monster, and if you do, destroy it, then inflict damage to your opponent equal to the destroyed monster's ATK or DEF in the Graveyard (whichever is higher).
Target 1 Spellcaster monster you control; equip this card to that target. Twice per turn, it cannot be destroyed by battle or card effects.
All "Gagaga" monsters you currently control gain 500 ATK for each "Gagaga" monster you currently control, until your next Standby Phase. You can only activate 1 "Gagagatag" per turn.
Special Summon 1 "Gagaga" monster from your hand as a Level 4 monster.