Use not only Yukayuka☆Threee, but also Nova//Memoria, Natural Planet and Tawil//Memoria, Crimson Evil's abilities well to interfere with your opponent at the beginning of your opponent's attack phase or whenever a SIGNI on your opponent's field attacks to advance the game!
From the early stages of the game, try to crush your opponent's life cloth while blocking their attack. Please pay attention to the situation that your opponent's life cloth cards are always fewer than your own, so you can put pressure on your opponent and gain an advantage in the game.
Put Daihouika, Aquatic Phantom Diva and Firefly Squid, Aquatic Phantom Deity on the field and reduce your opponent's hand while you draw cards yourself using their respective abilities!
First, play Daihouika, Aquatic Phantom Diva and Firefly Squid, Aquatic Phantom Deity or Manomin, Azure Evil to reduce the opponent's hand. When the opponent's hand becomes fewer, attack at once with Urith//Memoria, Doomed Evil Queen and Anna Mirage, Doomed Evil of the <Demon> class.
After using Unbreakable Javelin, you can return all SIGNI on the opponent's field to their hand by using the Game1 ability well!
Let's put Nightile, Jade Wisdom or Hideyoshi, Jade General Queen on the field while increasing Ener with Bang//Memoria, Jade Evil or Churin, Natural Plant. Thanks to Ann III, Maiden of Mettle's Action ability, you can easily use Ann//Memoria, Jade Beauty Queen or Patra Type: Drei's Action ability, so you can play flexibly according to your opponents.
The ability with the demerit cost that you discard a card from your hand should be used when Allos Piruluk/Memoria, Great Insect is on the field if possible!
You can reduce the power of your opponent's SIGNI by using Iona, Triangle/Maiden's Action ability every turn, or you can vanish your opponent's SIGNI at once by using the Game1 ability. There are many ways to put <Demon> SIGNI on the field or add it to your hand, so you can always put SIGNI on the field for a more advantageous battle.