(Disclaimer: I don't own Girls' Frontline or any characters in it. I just own the OC)

Life 4: The Zero Exception of Anti-Rain I -Cooperation-

"You know? Life can be a cruel mistress sometimes," Zero said as he was inside a military copter heading to his destination, "Seriously, to lending those Anti-Rain T-doll, she asked "that" as the payment? Seriously. Didn't Angelica told her that I really didn't want anyone to know about it?" while he was grumbling, the copter is finally arrive on location, or as close as possible to the location due the place he was heading is basically the Sangvis Verri occupied site, means there are several androids who really want and like to put a hole on his body upon discovered, "Well, if that's what she want to play, I have my own card to play it. Oh, we finally landed."

Once the copter stops from trembling, Zero open the door and see the scenery in front of him. The location is deep inside a mountain, surrounded by thick forest, which is very advantageous for ambush and such. However, to ambush Zero is basically near impossible to zero, means so far no one ever able to ambush him, unless he allows it and most of the time it's because he's impatient on finding his supposed target on the mission, "Thank you for the ride, captain! Let's have drink sometime in the future."

[I'll keep that in mind. Good luck on your mission!] the pilot said through copter's intercom. Zero then jump out from the copter and close its door before the copter begin to ascend and fly away from the location. Zero is watching the copter disappear on the sky before turning to the way where his destination is.

"Hm… no sign of any SF unit nearby… and that AR unit is still not arrived. Well, let's check out the location first," Zero said before heading to the location.

10 minutes later…

Another military copter flying toward the very same location of the first one. Unlike the first one, it brings four individuals equipped with their own assigned weapon, which is basically their call name. Those peoples, girls, or dolls are Anti-Rain team, the most renowned team of T-doll due their achievement in mission and the fact that they are very special T-doll that unlike any T-doll, their digi-mind can't or very difficult to be copied, resulting of destruction means death for them. However, they have been equipped with more advance weapon and experiences, thus it will help them on taking on every challenge they face.

[Approaching landing zone. Get ready] the pilot says as AR team prepare and check their weapon for the last time before they are landing. Once the copter landed, the man beside them open the door as they are jump out from the copter and checking the surrounding.

"Clearance confirmation?" M4A1 or called M4 asked.

"This side is clear," M16A1 or called M16 answered.

"Clear!" ST-AR15 or called AR15 answered.

"Same here!" M4 SOPMOD-II or SOP-II answered.

"Alright, it seems we're clear," M4 said as she confirming their situation, "There's no movement around us—"

"Hm? Hey, M4! Check this out!" SOP-II said as she pointing at the copter track on the ground, "Did it looks new to you?"

"…Yes, it looks new," M4 said as she looks at the track, "Who was here before us?"

"Either enemy, or "this" person they are said to be helper in our investigation," M16 said as she also looks at the track, "They said we will meet him on the location, but I didn't see anyone."

"No, M16. He was here before," AR15 said as she looks at the foot track on the ground, "Someone definitely here before, and he is alone."

"Then, where is he? Don't tell me he got captured by those Sangvis!?" SOP-II asked.

"No. If it was them, he must be dead now, no question asked," AR15 answered while looking at the track heading to, "He is going to there… wait, that's the exactly where we need to go! Dammit, that guy is heading there first!"

"Then, let's catch up on him! He may in trouble if he got found by any Sangvis' unit," M16 said.

"Alright, let's move out!" M4 ordered as they are begun to move toward the destination while the copter ascend to the sky. With how dense the forest is, the AR team must be careful on their footing and their mobility. Who knows when they will be got ambushed on their way toward the location. M4 is thinking about their objective and their collaborator. Their current objective to investigate and if possible, confirm the existence of the mysterious man who seems to going around with Sangvis Ferri's ringleaders, which is sound strange as the rogue dolls will kill any human on site, or their ringleaders will play a bit with their target depend on their personalities and then kill them in the end. For a human to work with them is unheard, so they are sending the best team they have to investigate the case. However, they are not the only one. It happens that Persica got a call from her connection that "they want to collaborate with the investigation", thus sending the best man they ever know for information gathering and infiltration job.

However, one thing they have learn about this man beside his capability and name is… nothing. No history, no record, nothing. All left is the name and that is. This man they send to help them is a complete mystery, an enigma, a ghost who only leave nothing but a name whenever on his trace. One thing in every military procedure is that you know your allies, but this man is nothing but a big question sign and it may be a fatal for them, but Persica seems to trust this man, as if she have meet him before and know exactly what he will do, thus entrust them with him.

"Are you still thinking about our man here, M4?" M16 through radio.

"…Yes. I can't help but to worry about him," M4 answered, "Should we trust him or be cautious around him?"

"I'll go with the latter," AR15 answered through radio, "There is no merit on trusting this person. Indeed, we are ordered to work with him, but if he made a mess then it's all his fault."

"That sounds mean," M4 said.

"Yeah, really mean."

"!"

The AR team immediately stop at their track and pointing their gun at the new source of voice that just speak. When they look up, they saw a man was sitting on the branch of tree, looking at them while raising his both arms in peace.

"Who are you? Depend on the answer we may shoot you," M4 demanded while still aiming her weapon at the man.

"Aww… to think even my collaborator didn't know who I am? That's hurt, here," the man pointing at his heart, "It hurt, a lot. Not physically but emotionally."

"Collaborator? Wait, you're this guy we are talked about!?" M16 said which gain a smirk from the man.

"Sure I am," he said before jump down from the branch to ground, landing safely despite its height from where he was before, "The name is Rei, you can call me whatever you want," Zero, or Rei in this case introduce himself, "And you must be the AR team, right? But to think only four of you here…"

"Even only four of us, that's already enough," AR15 said while still aiming her weapon, "And for what reason we can trust you as the person we're looking for?" upon her closer inspection, the man in front of her didn't scream "specialist" on what they had been taught. Zero is wearing a rather casual outfit, a black shirt with military camo pants and boots, with addition of long black jacket that seems not synchronize with what is inside. Even if he is the one, AR15 can't easily trust these people, especially someone with few-to-zero information about them. She known that with her sisters are enough for this mission.

"So… you want a prove huh?" Rei said as relax his body and look to certain direction, "Yo, eyepatch, eight o'clock. Enemy."

"Hn!?" M16 immediately turn toward where he is said and saw an SF's scout droid, Dinergate in front of her. Without hesitate, she shot it down before it can alert its friend. Other member of AR team also looks surprise from sudden encounter like that, "Whoa, lucky that I got it. Thanks for that."

"You're welcome," Rei said before looked toward another direction, "I suggest we change our location now. More may be coming from eyepatch's gunshot's sound."

"Alright, let's change the place," M16 said before turning toward Rei, "Also, my name is not "eyepatch", it is M16A1 or M16 if it's too long for ya."

"Sure, then let's go. I felt some disturbance not far from here," Rei answered.

"Okay, let's move out," M4 commanded while looking at Rei, "AR15, if you're still can't trust him, you're free to watch him."

"Already did it," AR15 said as she stare at him, literary while pointing her gun at him, "Now move. I'll be on your back in case you do something suspicious."

"So much for a trust…" Rei said as he follows the other with AR15 staying at the backline of the formation so she can watch over this man. He can simply leave them and just go by himself, but he needs everything he can use for the success of the mission, so all he can do is to be patient and let the flow coming to him. He knows that she will need to trust him soon enough like her sisters, which he thinks at least they trust him enough, even if just as collaborator. Therefore, the AR Team + Rei are continuing their mission to the location.

However, not long after they were leaving the death Dinergate, someone come out from the tree and check the scout robot, "Well, as expected from him. Even with camouflage module he can still detect it. I wonder how far he has "evolved"," the mysterious person said before he vanish into a black dust of crystal to nowhere, leaving the death Dinergate alone.

And... that's all for this chapter. It would be along chapter so I will seperate it into several part. Thank you to read my story and don't forget to review! (And please don't mention my grammar again, I was tried to fix it in my free time)