This story has been on my mind for awhile now so I decided to publish it here. It basically follows the Black Cat story plots that combine the anime with the manga, with a few twists of my own design. Many of the characters (especially Train and Dan) are OOC. I don't own any of the characters except the OCs, and refer all the legal rights to the original authors (I'm just being safe).

Note: In this universe, Chronos and Black are from a world known as Geminus, a world parallel to the one Dan and his friends are from.

Chapter 1: Enter the Black Cat

World: Geminus; Location: Unknown

The time of day was night, and the conditions were set. An enormous yellow moon lite up the clear night sky just as the sun would the day, causing the large stone cathedral below it to produce an elongated shadow. A soothing breeze was felt by the man standing on the ledge of the cathedral's window. He leaned against the enormous stain-glass, which gave off elaborate and bright colored blues, reds, and yellows in the moonlight. The breeze moved the man's separated bangs and his pure white coat in waves. He smiled.

The show was about to begin.

An enlarged shadow of a priest's head and hands darkened the glass with their movements. Inside, the priest shook a bowl of incense violently; as it could have been seen through the window. He did so as he spouted pleading prayers in front of his nuns.

"My Lord Jesus, forgive us of our sins and save us from the fires of Hell. Lead our souls to Heaven, especially those who need your mercy the most. My Lord Jesus forgive us of our sins, save us…"

The man had stopped listening to the useless rambling a long time ago.

"I beg you, please Lord! Please Lord."

But soon it would all end, and there would be silence. There was a slight shift in the air, as if something had sliced through it.

"My Lord Jesus, forgive us our sins, save us from the fires of…"

It happened again, only closer. The man on the ledge opened his eyes with curiosity. Finally.

Another man appeared. His figure was a dark spot in front of the moon. He flew twenty feet higher than the cathedral's highest tower and then dove towards its courtyard at an impossible speed. He face was serious, his eyes were focused.

He shifted his body weight for his landing, putting his feet in front of his diagonal body, his hair flying everywhere. Passing the stain-glass window, he unwarily pasted the man who smiled as the bottom of his black trench coat glazed his cheek and blew back his hair. Before his heels even touched the cobblestones in the courtyard, the man in black took off fast towards the cathedral's sanctuary. A passing nun barely turned her head towards him when the butt of his revolver hit her face and caused her to fall to the ground unconscious. He did not stop running.

Two more nuns stopped in his path when they heard the first nun's cries. The last thing they saw that night was also the end of the revolver. He continued to run, the skeletons of the tortured men and women were passed by the man's shadow as he flew into the sanctuary. Before anyone could blink he was in the center of the building, surrounded by nuns.

These nuns acted quicker. The pulled off their robes to reveal their army attire and sniper rifles they had hidden and pointed them at their intruder, ready to fire.

If only he wasn't gifted with such amazing reflexes. The frighten 'priest' hardly blinked when all of his 'nuns' were on the ground. Not a single shot was fired; yet. And this man, this assassin, was now at his level, holding him by the hair, forcing him to reveal his chin to the tip of the assassin's black and gold revolver. He gritted his teeth as sweat trickled down his face as the fear for his life swept through him. His eyes widened and his pupils shrank even more so when he saw the man's tattoo, which matched the engraving on the revolver.

XIII

"You're…you're one of them," he gasped. "You're one of the Chronos Numbers aren't you?!"

The man in black made no response to this. Though most of his face was concealed by shadows, he stared at the 'priest' with his slender golden eyes in a way that made the man's blood run cold. They were evil, heartless eyes that glowed in the night much like the eyes of a cat. Without blinking or emotion, he finally uttered the words:

"I've come to deliver some bad luck."

Outside, the act was perfectly visual and enlarged by the window. The smiling man did not turn around however; he just closed his eyes again, waiting. The enlarged shadow of the assassin's index finger slowly pressed down on the trigger as the 'priest' started to cry. The loud bang and the flash of light consumed the inside of the building; some could say there was the echo of a screeching cat in the bullet's blast.

There was silence after that. The 'priest' dropped to the ground. His lifeless body lying where he had stood, his eyes still wide. The assassin was gone. The smiling man laughed with delight, his ice blue eyes wide with pleasure.

"Ah, Fantastic! You're truly one of a kind…Black Cat!"

BC x BBB

"We have obtained full confirmation that the target is deceased." The picture of his target vanished off the holographic screen as the Elder took his place, along with the other two Elders.

"Excellent work, Thirteen."

"Your precision and efficiency were once again astounding," the second Elder included. "The tyrant has been eliminated and peace has returned to the village, so to speak."

"Now than," the third Elder spoke up. "On to your next assignment. Though it may prove to be a bit of a challenge, we have all the faith in the worlds you will succeed."

"Your stealth and cunning will be your greatest assets on this mission," the second Elder continued. "Considering its nature is top secret and because it will take place on Earth."

Thirteen blinked.

"Sepheria will fill you in on the impertinent details," the first Elder concluded. With that, the three screens vanished in the light. Sepheria rose up from behind him where she had been kneeling. He did not face her. "Train Heartnet," she said his name with a commanding and clear tone. "Your orders are as follows."

BC x BBB

World: Earth; Location: Bayview City, California

Kiara ran her fingers through her bangs and let them fall back onto her forehead. Standing in front of Dan's house, she couldn't help but sigh with displeasure. She really hated this.

Walking closer to the house, the faint melody of piano keys glided past her with the breeze. Kiara could sense the player's fingers stroking the instrument's keys with ease. The sound was clear and beautiful.

It was Dan's mother that answered the door, she tried to smile with kindness when she saw Kiara, but her eyes were worn and jaded from worrying. This only showed Kiara how much she cared for her son's wellbeing.

"Please come in," she spoke softly so as not to disturb the music. "Help yourself to anything in the kitchen." Sliding past her, Kiara crept into the kitchen and opened the freezer. She lifted a good sized cylinder off its resting place and placed it on the counter along with two bowls, spoons, and a scooper. Popping off the cylinder's lid showed smooth untouched ice cream, ready to be cratered by the scoop.

After preparing the ice cream she set the scoop down with the metal side sticking out to the side of the counter. Out of the corner of her eye she saw the scoop fall towards the floor. Narrowing her eyes, the scoop froze in thin air. Discretely, she stuck out her hand and it flew into her palm silently. She didn't want the music to be disrupted, did she?

"I saw that." A voice from behind her stated. Smirking, she set the scoop back on the counter, picked up the two bowls and started carrying them to the living room.

"Saw what?" She asked innocently to her Bakugan friend Drago, who was no more the size of a large red marble at the moment-he even looked like one. Drago laughed and flew over to her shoulder and popped out of his sphere form into the form of a miniature mechanical dragon.

In the living room Dan was still unaware that Kiara was behind him, she just stood there quietly waiting for the song to end. It had really surprised her that her friend Dan could play the piano so flawlessly, he really was not the piano playing type. This was probably the reason the blinds were down; among other things.

"You could play it an octave lower," she stated when he finished. Dan jumped a little at the sound of her voice, and then turned around with an embarrassed grin on his face.

"Do you really think so?" He laughed half-heartedly. Kiara shook her head and handed him his bowl of ice cream. She then plopped down to the stool next to him as Drago hopped from her shoulder to his. After two minutes of silence, Kiara started the conversation.

"I still can't believe you can play. In all the years I've known you I never thought of you playing a piano." With Dan's personality, the guitar or drums maybe, but the piano?

He smiled softly. "Yeah, I only recently started playing again." he said. "When I was younger, Mom made me take lessons. I loved it, but my patience told the teacher otherwise." He stared at his bowl. "It's just… now I have nothing else to do but play."

Kiara gave him a look of worry. The energetic boy she known for so long had become this…this…there were no words for Dan's current state. His eyes that use to be so bright and cheerful were now tired and showed lassitude in their almost maroon irises from lack of sleep. She could not blame him though, every time she was with their friends, the stares she got made her feel guilty of being the interloper of the group, and only because wasn't officially 'one of them'.

"So how is everyone?" Drago asked, changing the subject.

"Fine," she smacked her lips to get the chocolate that was stuck to the upper part of her mouth. "More or less."

"How so?" Dan asked.

"Marucho wants to sort things out with you," she began, "but he's caught between being a good friend and being a team player. Shun…" She then paused trying to find the right words for their friend, "Shun pretty much lost it when you left, I think. He's been battling so much, saying he wants to get the team back on top, but I think it's just because he can't talk about his emotions."

Dan clinched his fist around his spoon; Kiara's sudden change in tone matched the look in her eyes, she was worried about them and their friendship. When the 'disagreement'-Dan did not want to call it a fight- between him and his friends began two months ago, Drago and Kiara were the only once that stood by him. Drago's loyalty to Dan was unquestionable though, he was his partner, and the bond they shared couldn't be severed by anything. That and Drago knew why Dan was 'disagreeing' with his teammates.

Kiara was a different story. Marucho had called her while she was on vacation for back up after Dan and Shun's 'disagreement' had gotten out of hand, despite knowing the heavy emotional stress it would have on her heart. But it couldn't have been helped, Kiara was the only one who could reason with Shun and she was far too loyal to the team to not try to settle things between them.

But the outcome was nothing anyone had expected. Though Kiara had started out as an innocent peacemaker, anyone could see that she choose to side with Dan on the matter, whatever it was. In her mind, the team was being prejudice towards their leader for having a nervous breakdown in the middle of a battle. Though the fact that his pride and stubbornness on the subject did not help him either, but she believed that there was a deep, personal problem that had occurred recently that was causing this sudden personality change. She also believed that the team's lack of compassion and concern for their leader and friend was morally wrong. Their lack of privacy was another.

Friends do not betray their friends. This was a moral she herself lived by.

Just then the clock struck noon. They all knew Kiara would have to leave soon to go pick up dinner for her cousins because her parents always went out on Friday. "Well, I guess that's my cue." She picked up the bowls and headed into the kitchen, reappearing seconds later and heading to the door.

"Dan, Drago," Dan's mother called from upstairs, "could you go to the market with Kiara? I need some milk for tonight."

"Mom…" Dan groaned.

"Or, you could stay here and do yoga with me." Without answering, Dan quickly grabbed his jacket and was dragging Kiara out the door, Drago fluttering behind them.