After today at I.M.P., the gang returned to their homes and Y/N once again stays with Loona, which she didn't mind. Now, the next day has arrived and on Earth, the portal opens and Y/N and Loona were seen exiting it.

Y/N: Wow. So, that book is capable of opening and closing portals?

Loona: Yep. And many other things. That's why it's a very valuable artifact that can't fall into the wrong hands.

Y/N: Right. So, where are we?

Loona: We're in a place far outside of civilization. Nobody will find us here. And it's the perfect place to start training.

Y/N: Got it. So, what now?

Loona: Now? I wanna test what you're capable of. Show me what you got.

Y/N: What? You sure? But, I have no combat experience. Plus, you're a woman.

Loona: Well, that's changing. So, why don't we make it easy for you? *crosses arms* I won't attack you. I'll only dodge. Come at me however you want. I promise I won't hit back. And besides, our targets will be women, so even if you're respectful, people will use that to their advantage. Don't worry. We'll help you out with that.

Y/N: O-Okay.

Y/N got in position.

Loona: Fisticuffs, huh? Okay. Well, if you're gonna do that, then straighten out your position. Make sure it's enough to defend yourself all over.

Y/N got confused at first, but he thought of something. After cupping his right hand into a fist, he placed it to his hip and with his other hand, he curled his fingers one higher than the other and raised his hand to his face. He then spread his legs a little bit and was in a proper position to fight. Loona was impressed.

Loona: Wow. Nice. Alright, let's see what you got.

Y/N exhaled nervously as he wasn't sure what to expect since he's fighting a hellhound. He rushed to Loona and began trying to hit Loona, but Loona kept dodging. Y/N kicked her, but Loona jumped back. Y/N tried every tactic he could think of, but Loona was too smart and quick for him. After a while, Y/N panted heavily.

Y/N: *panting heavily* F-Fuck...

Loona: Sorry, N/N. You passed the battle position test, but everything else? Not very well. Sorry.

Y/N: Hah... Hah... Hah...

Loona: ... But, you do show promise. Maybe some proper training will fix you up. However, since you're human, the process will take a bit longer, so... This will be a work in progress.

Y/N: Throw whatever shit you have at me! I guarantee that I'll pass without hesitation!

Loona: You shouldn't say stuff like that, N/N. Training with a demon isn't something humans will be able to tolerate. Mich less a hellhound.

Y/N: Well, clearly, they're not me. I'm dedicated to do this, so come on. What you got?

Loona: Look at you. You're exhausted. You sure you want to keep going?

Y/N: *nods*

Loona: ... *sighs* Alright, but remember, YOU asked for this. Give me a sec.

She grabbed her phone and after a while, she opened a portal and Millie stepped through it.

Millie: So, what's the sitrep?

Loona: I need your help with training N/N.

Millie: And why me?

Loona: You're the only one who's smart enough to give someone instructions. Besides, I'm doing him a favor by toughening him up so that we can have him come with us on missions.

Millie: W-Wait... N/N, you sure about this? I don't think being an assassin is the right job for you because... our job can be pretty fucked up.

Y/N: Look, without you guys, I would've kicked the bucket when I gave up on everything. If it wasn't for Loona, I'd be dead, by now. But, she helped me, so to repay her, I wish to be trained in your ways of being an assassin.

Millie: A-Are you sure about this, N/N? I don't want you to be overwhelmed by all of this.

Y/N: I'll worry about that when we get to it. So, please, train me so that I can be useful. I'm fucking tired of being a pushover!

Millie: ... O-Okay. If this is what you want, then don't worry. We'll whip you into shape. Just don't be ashamed that you're being tutored by two girls.

Y/N: Hey, I have no problems, at all. Let's do this!

Loona and Millie looked at each other and at Y/N and nodded. And so, throughout the day, Y/N was going through some intense and tiring trials set by Loona and Millie. Y/N was struggling a lot, but his dedication and spirit didn't falter or fall apart. And it was thanks to that that he got through the tasks, but of course, at the end of the day, Y/N collapsed onto the ground, sweating and breathing heavily as if he couldn't feel his limbs.

Millie: Shit. I admit it. I was not expecting a human to be able to pass with flying colors. You're truly fascinating, N/N.

Y/N: Hah... Hah... Th... Thank... you... *passes out*

Loona: ...

Millie: Well, Loona, there's good news and bad news. Which one?

Loona: Bad.

Millie: *sighs* Well, the bad news is that this is just the beginning of Y/N's hellish training. I can't imagine how he's going to be able to pass without fainting or collapsing or falling apart. Hell, or lose a body part.

Loona: ... And the good news?

Millie: N/N's heart remains strong, despite going through all the Hell. And if he can keep his dedication and spirit remain strong, he'll be able to pass at the end of the week.

Loona: End of the week? Why?

Millie: Well, due to his performance out there and the fact that he was giving it all he's got, it's safe to say that... He'll catch up to our expertise in no time.

Loona: Good to hear. Nice to know we have that kind of human on our team.

Millie: Yeah. Lucky us.

They watched as Y/N was on the ground, snoring loudly. The next day and the next ones throughout the week, Y/N was out through a lot. He had to climb trees, shoot things, use swords and axes, and stealth kill things. The list went on, but despite that, Y/N kept going. Meanwhile, Blitzø and Moxxie were seen watching behind the scenes of Y/N's training course. And now, at the end of the week, Y/N was seen, sitting on the ground with his eyes closed.

Y/N: ...

Behind him, Loona approached him from behind. Y/N heard her coming and stood up.

Y/N: So, what's next?

Loona: A sparring match against me. In fisticuffs. No weapons. Millie will be spectating. Let's see how you perform.

Y/N: *nods* Got it.

Loona: Alright... Let's see how you handle a hellhound... when she's gone feral.

Y/N: ...

Loona closed her eyes and when she did, Y/N could feel the air vibrating a little bit as he could also feel Loona's aura beginning to turn dark and demonic. When Loona opened her eyes, no humanity was seen behind her eyes. All there was is the hellhound's feral instincts going overload. After becoming feral, she got on all fours and snarled. As Millie watched the stand off, Blitzø and Moxxie watched.

Blitzø: *thinking* Oh, shit. She's gone feral! Good luck, kid.

Y/N got in position and whistled loudly, getting Loona's attention and she charged at him. She leaped into the air and Y/N jumped out of the way, but Loona recovered and charged at Y/N. Loona swung her claws at Y/N, trying to scratch him, but Y/N dodged them and backed up a little and as they clashed, Millie watched and judged his movements.

Millie: Well, his movements have changed since last Sunday. And he seems to be sharper, focused, and hard-working. Sorry, Loona, but I hope Y/N makes it out of this. And I hope you don't actually kill him.

The battle continued as Y/N blocked most of Loona's attacks and dodged some that he couldn't block, but Loona was getting fasted and her attacks were sharper and harder as the feral instincts were going overboard. After a while, Loona wasn't showing any signs of exhaustion or anything that'll give Y/N the advantage and Y/N couldn't keep it up, but he has found a way to win. So, Loona charged at him and Y/N dodged and grabbed her arm and threw her over his shoulder. He pinned her to the ground as she struggled to break free.

Y/N: Loona! Loona, hey! Hey, look at me! Look at me, Loona! It's okay! It's okay. Stop! Please!

Loona struggled to break free and Y/N tried to think of a way to calm her down until he looked at Loona's ears. He reached up there head and scratched behind her right ear and to his luck, Y/N was actually calming Loona down as Loona was enjoying how his hand was working on her head.

Y/N: Now, Loona, look at me. You remember me, right? It's me, N/N. Y/N?

Loona: ... N-N/N?

Loona's senses were coming back to her as she was seeing Y/N, again.

Y/N: Thank fucking God. You okay?

Loona: Y-Yeah... I'm fine. *blushes* But, uh...

Y/N realized the position they were in and blushed as he got up and helped Loona up by grabbing her hand and pulling her up.

Y/N: I... I had to do that. You were going a bit too much there.

Loona: Y-Yeah. Sometimes, I go a bit overboard.

Y/N: ... Well, I thought you were hot when you're angry.

Loona: *blushes* I-I wasn't expecting anyone to say something like that.

Y/N: Well, it's the truth. What, you don't think so?

Loona: ...

She couldn't bring herself to say anything else and just turned away from him with her arms crossed. Y/N felt bad.

Y/N: I-I'm... I'm sorry if I misspoke or something. *thinking* Shit! Did I say something to offend her?

Loona: ... It's okay. Not a lot of people think so because... it's a way of protecting myself from assholes and perverts. And hearing you say that I'm hot when I'm angry...

Y/N: *eyes widen in realization* Ohh... R-Right. Sorry.

Loona: No, it's fine. Just tell me again under different circumstances, okay? For now... I just want to...

Y/N: I understand. And... I'm sorry. I just don't want to be on your bad side since I've seen it a lot. You're always angry.

Loona: That's not true! I-I... *sighs* Okay, I've never had a friend like you, so I'm new to this, okay?! Cut me some fucking slack!

Y/N flinched at that and looked away.

Loona: ... I'm sorry. Look, I'm adapting to this whole... friendship business, okay? I'm trying to get accustomed to this new discovery. Just... Give me some time to adapt.

Y/N: ... Okay. Thanks for teaching me, by the way. I learned a lot thanks to you and Millie.

Loona: Just keep up the pressure and keep training. Can't have you getting rusty now that you've completed your training.

Y/N: Got it.

Loona: For now, let's just go home and rest. We've had a long weekend.

Y/N: Y-Yeah.

Millie watched as they talked and walked away.

Loona: I know you're there, guys. You've been watching us the whole week, haven't you?

Y/N: *turns around* Huh?

Blitzø: Busted!

Loona: So, you were too eager to see N/N's progression, were you? Or were you so nervous for your daughter? Either way, don't think I'll let this slide!

Blitzø: *stands up* N-Now, now, Loonie, there's a simple explanation for this.

Loona: And what's that?

Blitzø: U-Umm... Well... There's a... Uhh... *chuckles nervously*

Loona: *sighs* You're both lucky I'm tired. But, don't think you'll be getting out of this unscathed. I don't approve of peeping toms.

She then opened a portal back to Hell and everyone stepped through it.

Y/N: *yawns* Well, I'm beat. After all of that, I deserve a nap.

Millie: You go ahead, N/N.

He collapsed onto the couch and instantly fell asleep.

Y/N: Zzz... Zzz... Zzz...

Millie: *sighs* Can you blame him, really? He's been at this for a week. And look at him, now. He's a little different than he was back then. Good for him.

Loona: Yeah...

Millie: Hm? What's wrong, Loona? You don't seem so proud.

Loona: Huh? N-No, no! I-I mean, yes! Yes, I am proud of him. I'm very proud. *sighs* It's just that... I feel bad for snapping at him back there.

Millie: ... Well, I'm sure he's over it, by now. I mean, he knows you didn't mean to.

Loona: But, I'm new to this whole friendship thing. I've never had a real friend. I know he means well, but... It's like my old habits are getting in the way.

Millie: Then, do something about it. Try a different approach. Just... Just be yourself.

Loona: What?! Millie, are you fucking stupid? I can't be like that towards him! What if he laughs at me?

Millie: Why would he laugh at you?

Loona: B-Because... J-Just answer the goddamn question, please?!

Millie: O-Okay, okay. Look, he's not gonna laugh at you. He would have no desire or reason to laugh at you for being yourself. I can't... explain how he'll feel about this, but I promise you that he won't laugh.

Loona: ...

Millie: Loona... Look at him. After everything that's happened, you expect him to laugh at your true colors?

Loona looked at Y/N as he was sleeping and thought about how he was acting. After thinking about it, she relaxed and sighed.

Loona: ... Okay... I'll try. But, tomorrow, I wanna do something for him. The real reason why we trained him.

Millie: And why's that?

Loona: ... *smirks* To kill his asshole parents.