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Killer Queen is the Stand of Yoshikage Kira, featured in Diamond is Unbreakable.

Killer Queen's powers revolve around setting up different kinds of bombs that can annihilate the enemies in one blast, making it a very dangerous Stand to face. Not only are the bombs powerful, but Killer Queen is also able to deploy two initially, then eventually three kinds of bombs with different strengths, giving the serial-killer a large array of options when dealing with his foes.

Yuuki had created Killer Queen with his power but it was more dangerous than the one in the anime. He didn't need to touch the object but he didn't want to make her too scared. He explained his power to Shiranui. 

Shiranui was a bit shocked when she heard that he had the power to turn everything into a bomb as long as he touched it. She thought it was a perfect power for assassination since she also saw the explosion didn't leave anything behind. She looked at him and asked, "Is this magic?" 

"Yeah," Yuuki answered. He used his magic to try to look for her. He saw that this place was quite complex. He could see there were still a lot of people even though he had incarnated them. He felt angry when he thought about her being held in this place but strangely his face was calm. He calculated everything perfectly and shot them with his gun. 

Shiranui also did the same and cut her enemy. She didn't want to lose to him and showed that she could save her lady. 

Both of them went together inside, they were fighting together against their enemies. 

Mermaids weren't that powerful in the land since they couldn't use their power efficiently here. They could only use a gun and sword to fight their enemies in the land. Only some of the mermaids had the power of song and sound magic to fight better in the land. 

Shiranui and Yuuki infiltrated the headquarters easily and defeated them in an instant. But suddenly they saw five people flying.

"Is that a magician?" Shiranui wondered. She had heard that this group had made an alliance with a famous terrorist group in the supernatural world. She had only her sword and couldn't fight against them. 

Yuuki aimed his gun and shot toward one of them. 

Bang!

The magician was startled and hurriedly using their magic, suddenly a surge of magical power came from the four magicians and they created a large amount of water. 

BAAAAAMMM!!!

Yuuki killed the four of them but he was swallowed in this water. He didn't stop them since he wanted to see what they would be doing. He used his magic to enable him to breathe on the water. 

Shiranui was glad about this water. She could move more swiftly and she got stronger. She suddenly realized that she also came with him and she knew that he was only a normal human, "Yuuki!!" She swam toward him but she saw him standing there and breathed normally. She looked at him with a surprised expression, "How can you breathe underwater?" 

"Is that important now? We need to save her," Yuuki said.

Shiranui nodded and looked like there were a lot of mermaids who came out from the hiding place and started to attack them. 

Mermaids have the power to control water. 

They had created this entire headquarters into an isolated place full of water. They were mermaids and they would get stronger inside the water. 

"ATTACK THEM!!!" 

They don't need a gun right now since they are invincible inside the water. They were holding several types of weapons from trident, sword, mace, etc. They attacked them at the same time while swimming very fast. 

Shiranui snorted and started to changer her lower body into a fish. She started to swim at a very fast speed and cut down her enemy one after another. 

The clear water started to become red after being stained by this war. 

Yuuki shot toward a group of people and created another explosion. 

BOOOOOM!!!

Yuuki kept making explosions around and incarnated his enemy. He also started to swim very fast toward the Sun-Chan's room when he found it. He thought the enemy must have some paranoia when he saw a lot of traps around the house. 

Boom! Boom! Boom! Boom! Boom!

Shiranui stopped when she saw a lot of explosions. She decided to save her energy and walked beside him. She thought his power was very useful in this one versus many situations.

They swam without any worries since the enemy was quite weak. But the most troublesome thing about this place was the trap. 

Shiranui wanted to curse them but she was glad that he was with him. She didn't expect that his explosion magic was just too profound that he could incarnate everything from magic, poison, virus, and everything. 

"Do you know where she is?" Shiranui asked. 

Yuuki nodded, "Yes, you just need to follow me." He continued to swim until he found a big door toward the underground, "She is there." 

Shiranui nodded, "Let's go."

Both of them swam toward the big door. 

Shiranui tried to open it but she couldn't open it. She tried to cut down the door but it was futile. She looked at him with a helpless expression. 

Yuuki started to think that she was somehow a bit useless. He aimed his gun and shot the door. 

BOOOOM!!!

The door incarnated and both of them entered the room. 

Shiranui was shocked when she saw the inside of the room. She saw hundreds of mermaids there with a murderous expression on their faces. She knew some of them since they were famous for the crime that they had done in their life. She didn't care about them but she was angry when she saw her lady was tied by chains on the wall. 

"Ojou!!!!" 

Sun closed her eyes and was unconscious. She opened her eyes slowly when she heard this scream, "S-Shiranui?"  

"Ojou!!!" Shiranui wanted to save her but she was stopped by someone, "Let go of me!" 

"Calm down, do you want to die?" Yuuki said and pointed his fingers at the criminal group in front of him. 

Shiranui realized her mistakes looked at those people in hatred. 

Clap! Clap! Clap!

"Welcome to Ryugajo!" 

Yuuki and Shiranui saw a man with a small figure but his body was full of fat. Both of them frowned, looking at this man. 

"Who is he?" Yuuki asked. 

"He is the boss of this group," Shiranui said. 

"He?" Yuuki looked at this man.