Whoopee! First ever Bleach/Kekkaishi crossover! It just came to me when I was re-watching Kekkaishi and I thought 'why not try a crossover?' and so here it is! I hope it piques your interest!

Disclaimer: I own neither Bleach nor Kekkaishi~

"I swear that the numbers are not decreasing at all! What in the world is going on? Ketsu!" Yoshimori yelled while forming a large blue squared Kekkai around a group of Ayakashis that were charging after him. "Metsu!" The Kekkai immediately shattered, destroying its contents at the command.

Huffing, Tokine tried to even out her breathing as she was exhausted from overusing her powers within a short time. Glancing around, she tried to comprehend what happened. It was sudden, as the Ayakashis gathered around and attacked the guardians of Karasumori land as a whole. Stopping to catch up on her breath for a second, she did not realize that her moment of break would prove to be dangerous for her as an Ayakashi had snuck up behind her and was preparing to use its scythe to slice through her.

"Honey! Watch out!" Hakubi her demon dog, who had whipped his head towards her direction as he smelled the Ayakashi close to her, warned but was too far to move fast enough to help her push away the attacker.

"Too late Kekkaishi!" the Ayakashi gave an evil grin and moved his scythe in an arc towards the girl. Turning around, Tokine's eyes widened as she realized that it was too late and mentally prepared herself for the attack but it never came. A shadow dashed past her and through the Ayakashi while slashing it into half. The Ayakashi had a shocked look in its face as it dissipated into thin air. Looking back over his shoulder, her savior leaped away and jumped up into the sky, his wolf-like claws slashing more Ayakashis as he did so. "Thanks Gen-kun!" Tokine shouted after the Ayakashi Majiri after recovering from her moment of shock.

"TOKINE! Are you ok?" Yoshimori ran towards her to give her cover as the said girl returned back to her fighting stance. He had also heard Hakubi's warning but he was too far and would be unable to reach Tokine in time too as the massive amount of Ayakashis blocked his path. "AHHHHH! These things are annoying me so much! We are wasting too much time here! It's gonna be daybreak soon!"

"Yoshimori, I have a plan and I will also need Gen-kun's help too…" Tokine discussed about her plan as she observed the pattern the Ayakashis were making and Yoshimori agreed to it. Making Kekkais airborne as stairs upwards, he leapt from Kekkai to Kekkai, reaching to the very top of the school. He heard several rustles behind him and closed his eyes, smiling. "I guess that you have already heard of our plan haven't you, Shishio?"

"That was insane! And I thought that it would never end!" Yoshimori stretched out his arms and gave a big yawn as he recollected the Shikigamis that he had dispatched to fix the school's surroundings using their Restoration Technique; he had been a little over-enthusiastic in carrying out the plan. "Right! Let's head back!"

"Thankfully it worked. Good work everyone but Yoshimori, you're always so reckless! If it wasn't for Madarao, you would have been stuck in that spot for ages!" Tokine berated the boy while they were on their way back home as Madarao laughed. "That's right Yoshimori! Come on, praise this helpful dog~"

Feeling a throbbing vein in his head, Yoshimori immediately grabbed his demon dog into a headlock. "Why you stupid dog! 500 years of being a demon dog and you still want to be praised!" "A dog is still a dog, I still want to be praised!" Madarao retorted and wrapped his snake-like body around Yoshimori's neck, strangling him.

"Get away from me! You are going to choke me to death!" Yoshimori pushed the dog away but Madarao simply refused to lose and hung on even tighter. Both Tokine and Gen watched at the sidelines, sweat-dropping while watching the two having an endless tussle.

"Do you think that it was Kokuboro that sent them over? I mean, perhaps that was a test to gauge our strength…" Yoshimori suddenly stated, his face serious.

Pondering over it, Tokine could not help but agree. "I agree too. Last night's numbers were way too off and they seem to be quite organized in their attacks. Moreover," she looked up into the sky "the aura in the air has changed… and I don't like the feeling of this. Ne, Gen-kun, what do you think?"

Gen turned his head to look at them, startled that they had asked for his opinion as he believed that his job was to help the Kekkaishis, and not interfere with their work. Blushing a little as he was not a man of words, he did not answer them but instead jumped onto the nearest roof and began to make his way home, leaping from roof to roof.

"OI! SHISHIO! It's rude to ignore people you know! Geez you insensitive jerk!" Yoshimori bellowed, waving his fist in the air. Hitting Yoshimori on his back, she whispered exasperatedly, "Shut up! It's still early in the morning! Do you want to wake the whole neighborhood up? You are so more suitable for the title of 'insensitive jerk'. And Gen-kun might still be getting used to us, give him more time."

Inside Kokuboro Castle, at the bridge that connects the two towers

"Ah Byaku. Don't ask me how I know your name. Why don't we call this a truce and let us work together to take over Karasumori Land? I will not forbid you to use my Hollows and you will agree to lend me your Ayakashis. I will order my minions not to attack yours during our truce. Besides, with our forces working together, we will be unstoppable. The Kekkaishis will not know what hit them. What do you say?"

The man named Byaku looked at them skeptically, pondering over the agreement. Their army of Ayakashis have been diminishing over the past years due to the increase of Hollows in their area. It was due to the Hollows that the Ayakashis were eaten up. Ayakashis were demons still with souls. He wasn't sure of the man's motive and did not trust someone whose minions had preyed on his. Suddenly he received a telepathic vision, sent to him by the Princess. 'Agree to it Byaku. I need that piece of land to recover…'

Deciding later to implant a worm to keep track of this man's motives, he approached him and stuck out his right hand. "Very well, I agree to it. We will work out of a plan later and meanwhile, reveal your name. I will not work together with a man whose name I do not know."

"My name is Sosuke Aizen and I look forward to our partnership." The man replied with an evil smirk.

.

.

.

"First Kaname Tousen, now Ulquiorra Cifer… As if cutting off my hand wasn't enough for mobilizing my own Fraccion, that bastard Ulquiorra had to stop my release. I want to let those Shinigami bastards see how wrong they were when they picked on the wrong Espada. Grrr!" An agitated Grimmjow Jaegerjaquez was heard growling. Thinking of a way to 'plot' his revenge on the two said men without the detection of his Lord, he staggered back to his room, passing by the conference room where the agreement was taking place and overheard some details of it.

Karasumori Land? 'The land that bestows power at night huh?' Looking down to his body filled with scars and injury, he let out a small laughter. "Watch out Tousen and Ulquiorra. The both of you are going to suffer the consequences of ever trying to restrict me."

"YOSHIMORIIIIIII!" An old man was dashing throughout the corridor of the house. It was one of the everyday routine that he would do. Slamming open the door, he made to rush in and perform his signature chop to wake his grandson up but instead his face met with a blue transparent Kekkai. Due to the strong impact, he fell backwards, his limbs twitching and his nose bleeding. The said boy just turned to his side, snoring slightly, completely oblivious to the incident.

"How absurd! Abusing and wasting your powers on some sleep. You are the 22th Legitimate Heir to the Sumimura Clan, the Sumimura family! You should be more responsible!" Shigemori Sumimura berated the yawning and sleepy looking boy who had just entered the living room, dragging his feet. "Don't you show me your mouth! Be more refined would you! It is a disgrace compared to the Yukimuras! We must always top them in whatever we do!" the old man did a dramatic pose and looked over to the next door, as if challenging them. Yoshimori gave a sigh and would not be bothered with his grandfather and continued to drink his favorite coffee.

'I only want to do my job well, and protect Tokine from harm.'

"I'm leaving." Yoshimori announced to his family as he prepared for school. "Yoshimori, don't mind your grandfather would you? I know he is a little too competitive but I know that he is trying to push you to become better. Being competitive will keep you on your toes and help you improve." His father, Shuji Sumimura, handed him his lunchbox, giving him his fatherly smile. Shuji was the only one in the family who couldn't see Ayakashis nor possess any Kekkaishi Powers but he was aware of the job that his son was in. Looking at his father, Yoshimori gave a small smile to his father who returned with a nod, indicating that he understood and with that, he left the house.

He walked a little while, before passing by Tokine's house. Standing in front of her door, he remembered the time where he had to carry her back as she had fainted from the wound the Ayakashi Yumigane gave her. Yoshimori had been too trusting and careless as he let his guard down. He was almost attacked and was saved by Tokine but it came with a price. Her hand was scarred and no matter what she did, the scar never disappeared. Thereafter, whenever Yoshimori sees the scar, he is reminded of his naivety and strived to become stronger.

"I'm leaving." Just as he was still thinking, the big wooden slid open and out came Tokine, who gave a little jump, putting her hand over her heart. "Ne! Yoshimori! What are you doing outside of my house? You gave me a fright!" Yoshimori was blushing. He had not expected to be caught standing outside of the door. Trying to hide his embarrassment, he stuttered "I-I-I was j-just t-tying up m-m-my shoelaces. It c-came loose." Tokine raised her eyebrow suspiciously. It was just a short distance from his own house and it wasn't a reason for his shoelace to untie themselves after a short walk. Upon realizing his lame excuse, he turned to an even darker tone of red and simply said a hurried bye and dashed off, leaving Tokine confused at the boy's actions.

Heaving heavily, Yoshimori bent down, hands on his knees and started taking in deep breathes to calm himself down. "Yah! That was an embarrassing situation! The next time I am thinking, I am so not going to stand in front of her house to do so!" Slowly catching his breath, he wiped the sweat off of his head and made to move forward but suddenly, he felt a hostile presence and his eyes sharpened, trying to find the source. Just as it appeared, it disappeared without a trace. Still on alert, he scanned around the area, ready to protect himself if he needed to but he could not sense the presence anymore. Confused, he put his right hand behind his head, scratching.

Grimmjow had just stepped out of Kokuboro castle, preparing to search for the sacred land. He was not going to take orders from anybody, not even Aizen whom he had once respected. Pinpointing the land to Karasumori, he touched the air lightly with his index finger. The air slowly showed signs of disturbance as a thin black line appeared horizontally and began to shift apart, revealing a dark void of swirling vortexes. Stepping in, the Garganta closed slowly and Grimmjow teleported his way to his destination. Upon arriving, he decided to release his Reiatsu, as he had been holding in so that no one would know that he had exited the castle. However, it was instantly regretted as he felt a strong spiritual pressure somewhere close to him. Immediately, he withdrew his Reiatsu and concentrated on the source. What if it was a Shinigami? It wasn't the plan to let them know that Aizen was collaborating with the Ayakashis. He would be in danger of being killed, much like that time when Aizen had threatened his life as he was about to attack Tousen. Moving around stealthily, he kept a lookout on his surroundings and explored the area, looking for the land.

Yoshimori circled around the neighborhood, looking for any weird sightings. It was highly impossible for an Ayakashi to be roaming around in the day but he decided to be safe than sorry. Confounded, just as he was about to give up and make his way back to school, he chanced upon a man who looked suspicious to him. He was not human, yet he was not an Ayakashi nor a ghost. Examining him, the man had light blue spiky hair and matching baby blue eyes. Under those eyes laid a green line marking. His attire consisted of a white hakama and a black sash and his white jacket is ragged with an upturned collar which totally covered his body.

No one in their right minds would wear something weird like that in broad daylight. Moreover, he was someone that Yoshimori wasn't familiar with in this neighborhood. Feeling a presence towards his left, Grimmjow turned his head towards it, revealing his Hollow mask that remained on his right jaw and it kept Yoshimori on the alert. "OI! You there! Who are you and what are you?" Yoshimori shouted over, his right index and middle finger on ready just in case for he felt that the man was a dangerous person to be around with. 'Oh? He can see me? But he doesn't feel like a Shinigami… I better not take my chance just in case I get unwanted attention.'

Grimmjow merely raised his eyebrows at the shout and looked at the boy, glancing at his schoolwear and wondering what kind of attire that was while not making any effort to answer his questions. "Oi! I am asking you a question!" Yoshimori demanded, preparing to use his Kekkai. This guy isn't normal, he is neither an Ayakashi nor a ghost.

"I give you another 3 seconds to answer me! 3…. 2…. 1…. Hoi! Joso! Ketsu!" Sensing the sudden spike in the boy's Reiatsu, Grimmjow's instinct made his body leap out of the way, while he himself was surprised at the boy's power. 'That is definitely not a Shinigami power. What is this boy?' He thought. Yoshimori grinned at the man who had landed several metres away from the Kekkai he had made; he always like competition. "You are sure fast to evade my Kekkai but now I am sure that you are no human! Ketsu! Ketsu! Ketsu!"

Many large blocks of Kekkai formed around the spots where Grimmjow once stood but never has a single one made contact. Frustrated, Yoshimori deployed more and more while increasing the forming speed of his Kekkais until he reached his limit. But no matter how much he tried, Grimmjow simply evaded all attacks directed at him with great amusement for that was something he didn't know about but he did not see the need to attack the boy, not yet. He would wait till he had more information about him and his powers. That would fulfill the requirements of his code of honor and then he will have no qualms about killing him.

Jumping onto the nearby roof, he gave one last look at the boy to remember his looks and gave a evil mocking smirk before leaping off and into the distance. "Wait!" Yoshimori hurriedly chased after him but had soon lost him.

"Who was that guy?"

For those who do not know,

Kekkaishi: Barrier Masters that are guardians to Karasumori Land. A Kekkais (square-looking barriers) are made by 3 commands: 1) Hoi - to designate a target, 2) Joso - to determine the location where the Kekkai is set up and 3) Ketsu - to activate the Kekkai. Lastly, to collapse it, Metsu is used to destroy its content.

Ayakashi = Demons

Ayakashi Majiri = Part human, part Ayakashi (Born with it)

Kokuboro = Evil group of Ayakashis

Reiatsu = Spiritual Pressure

Shinigami = Soul Reaper

So yup. How was it? This just came out at whim. OOC maybe? Since I have not watched the later episodes of Bleach and I'm not so sure of Grimmjow's nature. (but I do know what's going on! :P) Tell me how you feel about this story neh? :D