Summary: Seto lost another duel to Yugi and Mokuba accidently said he doesn't like duel monsters. They got into an arguement but that soon cleared. Mokuba then went for a walk and met two people. The two people asked him to come along and at first Mokuba didn't come but a while later he did. When he came with them , he met a girl. She told him that he has to enter a dueling competiton, Mokuba objected but then changed his mind. The girl told him that no one must know about his real identity, not even Seto, so now Mokuba has to duel as Sin. A guy Mokuba made up.

Sorry, i'm bad at summary's but the story is better, promise.

Hi! I'm back with another Mokuba fic, I've had this idea for like over a year but that was when I didn't know about fanfiction.
I hope you enjoy this story and please read and review!!!!!!! ^___________^

It was Saturday, an ordinary Saturday. Seto challenged Yugi then lost, got angry, and now Mokuba's comforting him by staying in the same room as Seto and make sure he doesn't do anything irrational.

"Damn that midget!! Damn him to hell!" yelled Seto, "I have a better deck, I had everything planned Mokuba!" "I know Niisama but one day, there's a chance you can win." Comforted Mokuba, "You know, why don't I turn on the T.V. and we can watch something funny and then you can make fun of it like the good old days."

Mokuba walked over to the remote and turned on the T.V. which was on the news channel.

Newsman: Here it is folks. Seto Kaiba just lost another duel against the all time champ. Yugi Muto, when will that teen learn that he will never win against Yugi—

Seto threw something hard at the T.V. "Niisama!" yelled Mokuba out of shock. "I will win against that midget if that's the last thing I do. I will be the King of Games; I will be the best duelist ever!"

Mokuba sighed then accidently said out loud, "What's so great about duel monsters, it's a stupid children's card game and everyone freaks out about it, jeez. When will these people grow up?" "Mokuba!" yelled Seto out of disbelief, "How could you say that!?" Mokuba's face was red, "Oops, did I say that out loud, heheh."

"Duel monsters is a great game, and because of that children's card game you live the life you have now. Without duel monsters we would be living like Yugi or the mutt." Stated Seto then Mokuba said, "I get it Niisama, it's just that I don't like duel monsters. I like watching you play but me…no." Seto sighed, "Alright Mokuba but you should try it once in a while. Come to think of it, have you ever dueled?" Mokuba thought about it, "Well once when Pegasus kidnapped me but it wasn't my deck and I didn't even finish the duel." Seto chuckled, "Who did you duel?" Mokuba was about to leave, "Yugi, oh and I'm going to go for a walk, 'kay, bye!"

Seto was about to tell Mokuba to wait, "Yu..gi? He fought Yugi?" Seto sighed again then remembered Mokuba going for a walk. "Ah! Mokuba! Wait!"

Seto caught Mokuba before he could even reach the door, "Eh? Niisama, what's wrong?" asked Mokuba, "Mokuba, here. In case something happens, call me alright? And don't stay out too late, I don't want you hurt." Mokuba smiled then nodded. As Mokuba left Seto said to himself, "Sometimes I wonder if Mokuba has too much freedom. Oh that's right! Mokuba has a little journal. He never lets me see it so maybe if I can find it today, I can see it but it would mean breaking the bond of trust Mokuba and I have. Hmm…Where's that journal?"

Mokuba sighed, "Duel monster, what a stupid game. I mean for crying out loud, it's a child's game." The young Kaiba found a bench and sat on it. After a while Mokuba saw a man who had short chestnut hair and green eyes. He wore clothes similar to Marik.

"Mokuba." Said Seimei (the man with chestnut hair), Mokuba turned towards him, "Do I know you?" Mokuba asked. Seimei laughed, "Well you don't but you do. It's confusing but everything will be known if you come with me." Mokuba shook his head, "Sorry, my Niisama told me not to go with strangers." "Ah Mokuba, but you do know me. Deep inside your heart you know me." Mokuba was getting kind of freaked out, "Um…you know…I'm gonna go now and leave you. BYE!"

As Mokuba was about to leave Seimei grabbed Mokuba's arm, "No! You can't go! You're coming with me!" "Let me go! I'll call the cops if you don't let me go!!" Mokuba yelled. Seimei didn't let go, "I'm not the bad guy here, now just come with me. Now! It's not like I'm kidnapping you!"

Mokuba was really scared but he wasn't going to show it. He then kicked Seimei in his stomach, "OW!!" Mokuba was now running until a black portal appeared and came out a man, he had long black hair, red eyes and an all black outfit, and he was pretty hot.

"I'm sorry for my stupid partner's behavior Mokuba, he's not a people person." Said the mysterious hot guy. "Why won't you guys just leave me alone, I didn't do anything to you!" said Mokuba, now crying. The man bent down to Mokuba's height, "I'm sorry but we do not want to harm you, so please, stop crying. We need you but not for bad purposes." Mokuba wiped his eyes, "Who are you and why do you need me? I'm nothing special."

The man smiled, "My name is Rai and I cannot tell you why we need you if you don't come with us but please don't fret. We are the good guys here." Mokuba tried not to look into his eyes but something about them just felt so trusting, Mokuba nodded, "Alright but keep him away from me, he's scary." Rai glared at Seimei, "Of course." Rai made another portal, "You go in first Mokuba." Mokuba nodded.

"You were assigned a task, a very simple task. It was to bring Mokuba into our world but what do you do, make the child afraid of you." Scorned Rai, Seimei pouted, "He kicked me." "GROW UP."

"Well, let's hope I made the right decision trusting him." Said Mokuba who went over to a hallway, "Wow, this place looks pretty cool." But what really caught Mokuba's attention was a room with all these duel monster cards. "This place had cards I've never seen before, Niisama would love this place." As Mokuba was about to touch one of the cards Rai called out to him, "Mokuba, come here. You must see someone."

Mokuba turned and nodded. He followed Rai and Seimei to the person he has to see. When he got there Mokuba saw a young girl with really long silver hair and purple eyes holding an orb. She looked as if she was a priest.

"Hello Mokuba, My name is Starlight." She said as she let go of the orb and the orb was floating, "Come here Mokuba." Mokuba looked up at Rai and he nodded, Mokuba let go of Rai's coat and went over to Starlight.

"Now Mokuba, you may have heard this many times before but I shall say it again, you are the only hope for this universe." Starlight said but then Mokuba interrupted, "Um, no one ever said that to me." "Oh, well anyway, here." Starlight handed Mokuba a deck and a bag. "What's this?" he asked. Starlight chuckled, "This is your deck, why don't you look through it?" Mokuba took the deck, "Wow, these are just like the cards I saw in that room. I've never seen cards like these before." "That's because, in the realm of earth, cards like these are not there. These cards are the read duel monster cards. Not those childish cards like Exodia or the god cards. The ones you have are much stronger but that doesn't mean those kiddy cards can't beat them." Mokuba looked confused, "B-but…"

Starlight went on, "Now here, this is a new outfit. You shall be competing in Pegasus's competition--" Mokuba didn't let her finish, "No way, I'm sorry but I don't duel. In fact, I hate duel monsters." Starlight got impatient that's when Rai took action, "Um Mokuba, please let Starlight finish speaking, she hates it when she's interrupted." Mokuba nodded then thought, 'Just like Niisama'

"Now I shall continue," Said Starlight, "You must compete in Pegasus's competition because if you are recognized than 'they' shall come from hiding and you, as Neo's incarnation, 'they' shall sense your presence thinking it is Neo. So when you duel, you shall wear this outfit then no one will know it is you. Have any questions now?"

Mokuba thought about it , if he said 'no' then he would go back to being same old worthless, useless, good for nothing Mokuba but if he said 'yes', then he would be a mystery. Mokuba would have a secret life, he would be someone that would be special instead of Seto Kaiba's little brother. Mokuba took in a deep breath, "I would but I can't duel."

Everyone in the room laughed the Starlight said, "You can duel and after all, you are Neo's reincarnation. Also, have you ever tried to duel, did you ever dueled in your life beside the time with Yugi, the soon to be ex-king of games." Mokuba thought about it, "Well no and what do you mean 'soon to be ex-king of games' I'm not a better duelist than Yugi. Niisama couldn't even beat Yugi and Niisama's better at everything than me."

Starlight smiled and looked at Rai. Rai came to Mokuba, "Do you honestly believe that Mokuba, everyone has something they're good at than someone else. There may be a lot of things your brother is good there is something you're good at—dueling and not just dueling, I know there are things you are good at." Seimei then came to Mokuba, "Listen…um…I'm sorry for how I acted when we first met. Rai's right, I'm not a people person but I hope we can start over as friends? Maybe? Oh and by the way, my name's Seimei."

Mokuba's grin was ear to ear, "Yeah that would be cool, Seimei." He turned to Starlight, "Um, Starlight…who's Neo? You guys keep talking about him and saying he's my reincarnation and who are 'they' like I get that they're the bad guys…"

Seimei patted Mokuba on the head, "I actually thought you were going to ask a lot more questions" he chuckled, "well Neo…we don't much about him but we know that you're his reincarnation. You don't look much like him and you don't act much like him either but you have his dueling skills. Neo…he-he's a great duelist, he's better than Yugi's Yami, in fact, he is the greatest duelist in the world…and 'they' as you're referring them too is The Net. They are a society of paranormal people. They track down people like us but the Net haven't found out about us…yet."

Mokuba still seemed confused, "Like us, they track down duelists? Then why hasn't Yugi—" "Yugi" said Starlight, "does not have The Mark like us, like our society. The Spiral." "The Mark? What Mark?" asked Mokuba. Rai chuckled, "We can't tell you everything, not now at least."

Mokuba sighed, "I guess that's fair but um…like should I tell Niisama?" "No, unless you want involved and if he is then I can promise you that he will be harmed." Stated Starlight in a slight harsh way, Mokuba didn't have to think about it, "Alright, I won't tell him but won't The Net see me, Mokuba Kaiba?" "That is why you have the costume, when you duel you will wear that so no one will recognize you." Said Rai then Mokuba, again, replied, "What about my name. I'm pretty sure—" Starlight sighed then did a little laugh, "He he, I didn't even think of that, well I believe you need a name, what shall it be. I want you to pick Mokuba."

Mokuba thought about it, "Well, I always like the name Sin, how about Sin?" They all nodded and then Seimei said as he came over to Mokuba, "Well Mokuba, Welcome to our family! Why don't we all say a little about each other! Starlight, you go first." Starlight smiled, "You are so cheerful." They all laughed and Mokuba smiled thinking, 'Family, I like the sound of that…it would've been better if Niisama was here…NIISAMA!!!!' Mokuba slapped his head, "Oh No! Niisama will be really mad at me."

"What's wrong?" asked Rai with a worried face. Mokuba took his phone out and saw that it was 9:00 P.M. and Mokuba's been out since 4:00 P.M. "I have to go, I really do or Niisama will be mad at me. I nodded my head agreeing I won't stay out too late." "Alright Mokuba, follow me." Said Rai, "I'll take you home and remember, you must enter Pegasus's competition." Mokuba nodded, "How can I ever forget a night like this."

Seto was at the manor still trying to find Mokuba's journal, "God damn it! Mokuba is so good at hiding things or maybe I just lost my touch." While Seto was talking to himself, he was just about to give up until he fell over something. "What the…!" Seto smirked, "Ah ha!" He grabbed the pillow and opened it revealing a journal. "Wow, this is one futuristic Journal. And it just had to have a password it looks as if Mokuba doesn't trust me but then I am…" Seto looked at what he was doing. He was going into Mokuba's room and trying to find his journal so he can find out about Mokuba's secrets. Seto was destroying the bond he has with his precious little brother. "I-I really shouldn't but Mokuba doesn't tell me things like if he's in trouble or if he's hurt and I need to know. Or maybe he's mad at me for something I don't know but if Mokuba finds out about this I don't know how I'll redeem myself…" Seto was about to put the journal down until he saw the clock. "What the hell!!! Mokuba was supposed to be back by now! Oh no, what if he's hurt…damn it! What's the password?" Seto saw a hint button and when he clicked on it, it said: "One word". Seto sighed, "Yeah, like that's going to help." The CEO thought about it, "Ok, how about Mokuba" WRONG "Niisama" WRONG "Cute" WRONG!!!

"Ugh!" Seto looked at the clock, "Okay, calm down…Damn it I'm getting pissed! Mokuba knows he shouldn't be out this late, I'm going to wait in living room until Mokuba get's here."

Rai and Mokuba arrived before the Kaiba Manor, "Good night Mokuba." Said Rai as Rai was about to leave Mokuba held on, "Um…will I see you again? Will I see Starlight or Seimei…" Rai patted Mokuba's head, "Yeah, I told you, we're a family. Family doesn't just stop seeing each other after they first meet." Mokuba chuckled, "Yeah but when? When will I see you guys? Like do I call or something?"" Rai smiled, "We, The Spiral, have been watching over you, Mokuba. We were waiting until the time was right to bring you into our family. We will meet again when the time is right, Goodbye, for now." Mokuba smiled, "Bye…" 'Now let's see how mad Niisama is at me.' Thought Mokuba woefully.

Mokuba opened the door and saw Seto sitting on a couch, "Mokuba!" He yelled, "Where were you! I was so worried!" "Niisama, I…I was at the park, well not exactly the park, I was sitting on a bench and then…let's say I just lost track of time." Seto still looked mad but Mokuba did somewhat tell the truth but Seto didn't buy it, "Really? And what were you doing that caused you to lose track of time?"

Mokuba knew he couldn't tell Seto the truth but Mokuba can't lie. "Well?" questioned Seto, Mokuba took in a deep breath but then he's eyes were widened when he saw Seto holding his journal. "Niisama, why do you have my journal?" Seto saw that he was holding Mokuba's journal, "Um…I-I can explain…I—"

Mokuba grabbed the journal out of Seto's hand, "How could you! I trusted you and you-you did this to me!" Mokuba tried to cry to make his fit look convincing but fake crying is harder than you think, Mokuba still hasn't perfected it yet.

Seto felt unruly guilt, "Mokuba I—" but Mokuba didn't listen, he just ran to his room.

'Thank you Niisama for taking my journal, because he did it, now I have an excuse but…I am kind of disappointed in Niisama. He went in my room and took my personal journal. Thank god he doesn't know the password.' Mokuba thought.

Seto came in Mokuba's room, "Hey Mokuba." "Niisama…" Mokuba pouted, he wanted to look convincing, "Look Mokuba, I'm sorry but you never tell if anything is wrong so I have to know." Said Seto as he sat next to Mokuba. "Well Niisama, there are reasons I don't tell you. I just don't want you involved." Said Mokuba, Seto smiled, "I have to be involved, if you're in trouble then how will I know? Anyways Mokuba, let's forget today. If you'll forgive me for taking your journal I'll forgive you being late." Mokuba smiled and nodded.

Seto got up, "Oh and Mokuba, don't try to use your crocodile tears on me, they won't work. I know when you're really crying and when you're not. Also, if you're going to act like you're upset you should add little more distraught in your voice." Mokuba's face was red, "H-how did you…" Seto chuckled, "You're my baby brother, I raised you as if you were my own, I think I would know." Mokuba sighed, "Um…Niisama?" "Yes" Seto replied.

Mokuba got his Journal, "The password to my journal is 'Worthless'" Seto was a little shocked, 'Is he testing me or something and why would his password be 'worthless', Mokuba doesn't think he's worthless does he?' "Mokuba, what's going on? Why are you telling me your password?" asked Seto. Mokuba smiled half-heartedly, "You wanted to see what was inside of this, well here." Mokuba handed Seto the journal, "No Mokuba, I'm not going to break this bond." Mokuba now really smiled, "Thought so." "Ah ha! I knew you were testing me!" Seto laughed and so did Mokuba.

That night went great, Mokuba and Seto said good bye to each other. Mokuba is safe for now but not forever, he can't keep lying to Seto. Once he enters that competition, Mokuba will be lying to the world about his identity as Sin.

Well!? What did you think, did you like it? You know, I really wish Mokuba was the main character in Yugioh TT^TT
oh, sorry if the characters were a little OOC and I hope it wasn't too confusing with The Nets, The Mark, The Spiral, and Sin
Review please! If you do I'll update sooner! ^-^