After receiving Yoshino's kiss he finally got 10 hearts for her, letting his life point reach 6000 and increase his ice ability. Now he can use freeze time and summon minions that come to life like Esdeath. This may be not much of a boost since he already has Esdeath's ice ability, but she has been training for many years to achieve this level of skill while Katsu got it immediately not only that he still has a lot of potential to develop this skill further.
Now he wanted to get blue eye white dragon to approve like Mana to summon it without any cost so he create many ice golems to get ready for battle.
Many monsters have different requests to become his spirits like Summoned Skull he has to achieve world domination and no way he goes all his way to do that.
Blue-eyes White Dragon request is much more normal but harder. He only needs to beat the dragon. This may sound easier but no because he has to fight the dragon at its full potential which means he will fight it with its real body, not the summon kind that disappears after receiving a strong hit.
But he has to do this as he has more spirits, he will be targeted more so he wants to get Blue-Eyes White Dragon strength. He also has a trump card he hasn't used.
[Spell card Final countdown: Pay 2000 life points. After 200 seconds a hole will appear in the sky either killing all enemies or trapping them until the host lets them out. After using this card it will be banished.]
With this card, he only needs to stall for time to beat it so after everything is ready and Mana already merges with him and he accepts the Blue-Eyes White Dragon challenge.
The moment he open his eyes he was greeted in an unfamiliar arena opposite to him the dragon staring menacingly at him.
Immediately he activates his card [Infinity Trap card Solemn Wishes: Summon a rain that will increase 500 life points with each card you use. Can be used again in battle] and [Final countdown] and finally, the battle begins. At the start, he already sacrifice 2000 life points but the rain started to pour down from nowhere refreshing his health and spirit.
The dragon roared at him and a sonic wave launch from its mouth. Immediately, he created a wall of ice and a pink shield wrapped around him. The sound wave destroys the ice wall and pushes him flying hitting the wall and destroying a part of the surrounding arena. Even though the ice wall block most of the impact and the pink shield protects him the dragon is much stronger than he imagines if it is already this strong with only this move he doesn't want to know what would happen if it fire the laser beam.
(4000 points)
When the dust is clear he split out a small amount of blood and walks out with a giant board sword.
"Come again"
Almost like receiving the signal, the dragon spread its majestic wings and launch itself into him. Naturally learning from his last lesson Katsu won't dare to let that dragon touch him or he will die instantly.
[Trap card Trap Hole: This card can put a person into a hole 2000m deep].
Almost before the dragon claw reaches his body the card force it to teleport down to a hole.
{I never imagine this kind of card is so useful now}.
Of course, the hole was only used to delay the dragon a bit but the dragon is trapped in a confined space so immediately he takes out his combo.
He already set all of his summon monsters so now he can directly summon them without waiting to summon the sacrifice.
Once the [Summoned Skull] is on the field he used [Solemn Wishes] to get the dragon wet since he didn't do any damage to it yet so the healing rain won't have any positive effect on it but by making the dragon wet the freezing effect is much stronger. So when he used his ice ability the wings of the dragon stopped flapping and fall down very fast from its weight but it quickly breakout from the ice after 5 seconds of falling.
[Spell card Raigeki: Summon a thunder that strikes the enemies damage depending on the host and enemies ability]. The sky becomes darker as Summoned Skull charges all his ability, Katsu also takes out Magic Formula intending to use all this thunder to convert it into energy and charge his sword Sandalphon.
When the thunder strike Katsu raises his book into the air absorbing a large amount of energy from his spell card and summon. His sword began to glow blue brighter and brighter it is bright enough to illuminate the whole arena.
Holding the sword in his right hand for any minute slowly decreasing his life points while [Solemn Wishes] keep on repairing his body as his life points drop to 500 he stops.
He finally swings his sword, and as the sword drop beam of light gushes out like a storm even the hole that is almost Blue-eyes white dragon size is not big enough so the beam cut through the dirt completely destroying the landscape and traveling at high speed in the dragon's direction.
The dragon opens his mouth and fires a beam of light clashing with his own.
The whole arena is shaking continuously like an earthquake. His body is completely numb after using that strike even Summoned Skull energy ran out turning into a card again. Noticing the situation isn't right Mana comes out of his body and quickly takes him flying away.
After a while, a deafening explosion a mushroom cloud happens like someone presses a nuke blowing the place into smithereens setting off an extremely terrifying sandstorm.
They finally landed near the ruin and look at the massive hole that had just been created.
A roar sounded in the air as the dragon come out of the place. Its wings are completely shredded while it lost an arm and has a deep cut dripping with blood from its belly but it's still alive. The dragon open its mouth and wanted to fire another shot at the two.
Mana is frighten wanted to defend but Katsu shakes his head and smiles they already won.
Instantly, a giant hole rips through the sky as a demonic-looking face appears. It opens its mouth like a gateway through hell and spilled out a giant fireball that completely swallows the dragon.