Puppy

"Everyone, this is a dangerous place, and since there are too many physical class students, one of the group's will have to go by themselves, but will also have their own teacher defending them, In case we get seperated" one of the seemingly normal teachers said

"That man seems to be too.. unimpressive, to be an adventurer" one of the students near Kira said, making him chuckle

"What are you finding funny?" Lea asked, curious of what he was laughing about

"The more simple they are, the more experience they have, the better adventurers they are, adventures with experience know that they shouldn't flaunt their powers, only those at the top 0.001% are able to do it without worrying, at that point not many people will be able to hurt them so they don't worry about the danger of potential" Shiro replied for Kira

"Flashy armour can be sold for a lot and rookies use them more, makes then an easier target, blah blah blah, you get it" Kira told them, and they realised how much sense that made

"How would you know that?" Lea asked, since although it made sense, someone normal wouldn't have thought of it 

"You'll know" Shiro told them to end the conversation 

Then they entered the dungeon, Shiro's team with only a teacher and no one else, the teacher death with the monsters, at first it was only weak slimes, easy to deal with, then goblins, still not too bad, it got to cobolts, which they had some difficulty with but not unbearable

They started to be challenged by the giant wolves, they weren't weak at all, but Kira wasn't bothered to fight something he saw as weak, and Shiro didn't believe that the wolves could kill them so he tanked the hits and let them get more experience in fights

After a while they heard a roar in another area, the teacher asked them to stay in were they where, they were obedient however they felt that something would go wrong

"This is boring, let's go to the next floor" Kira told them while rolling on the ground

"No, we need to stay here so we don't fuck things up" Neo replied, surprising everyone

"You don't usually swear, what's wrong?" Shiro asked his friend, slightly worried

"I used all my patience yesterday while blacksmithing and don't have enough to deal with bullshit" Neo replied, in a tone that was slightly annoyed

Taking this opportunity, Kira's arm glowed with a red tint, Shiro instantly noticed and shouted to him

"Kira no!"

But Kira didn't care anyways and replied

"Kira yes" 

He then smashed his hand into the floor, and deactivated the glow, the floor broke and so did many of the others below, in a giant boom, they fell down, and Neo, without any patience, just sent many insults at him, not holding back

Lea and Vera were screaming, not expecting this, but quickly calmed down. Shiro facepalmed, then wondered what he expected Kira to do, and the idiot himself, Kira, was laughing, wondering what he dragged himself and the others into

Once they landed, they looked ahead, In front of them was a giant door with three dog heads on them, each holding a silver door knocker

Kira opened the door before anyone could protest, and inside was a black, three headed dog, with a spiked collar on each neck, floating above its head was its name

[The Child of Cerberus, Puppy]

Kira was looking at the name, slightly disappointed "who would name someone that?" He asked no one in particular, and looking around

He saw that the others were shocked seeing suck a fearsome looking creature and Shiro just facepalming at its name, he entered without problem

By the time Shiro realized it was too late, Kira couldn't leave without beating the beast now, he looked excited and rushed towards it, wanting to fight it immediately, but his attack was dodged, and he felt his danger senses flaring at him, telling him to move to the left, but he was in the air so he didn't have the chance

Shiro saw that the dog was running towards Kira, opening its mouth to bite it, he thought that Kira was going to make a magic circle to dodge but he then realised that his brother forgot about that, he quickly used the magic he knew to boost his speed to the limit his body could handle, not bothering to think about defence, and dashed forward

He was fast enough to reach there in time, but his body moved faster than his mind could process what was happening and he couldn't think of his next move in time

Meanwhile puppy didn't stop, only changing his target to the seemingly weaker target, and used one of its heads to bite Shiro, but what happened shocked it and everyone else even more than Kira's foolishness

It's teeth shattered, some of them entering its mouth and scratching the inside of its throat, the head whimpered in pain, and so did the others since they were all connected

Kira went under the its stomach and kicked it up, angry that it hurt Shiro, then he jumped, and when the two met in the air he sent a flurry of punches at it, then grabbed it's leg and swung him downwards

Puppy landed hard on the floor, losing most of its hp, and Kira was falling, it tried to turn but his body was buried in the ground enough for it to not be able to turn, all it could do was pray that it was lucky

But luck in the end didn't matter, since a faint red light covered Kira's leg, he crashed into the beast, going through its body and bringing its health to zero

Finally snapping out of it, the other three ran into the room, Vera went to Kira and slapped him

"What the hell were you thinking asshole, you could've gotten us killed, look at Shiro!" She screamed, her rage easily heard

The two turned at Shiro, and found him completely fine, although unlike Vera, Kira already knew he was gonna be fine

"H-How" Lea stuttered, not understanding how he could survive a bite from something that seemed like it could turn them into minced meat

"I have an unnatu-" Shiro said, but was cut off

"He's a tank, it's that simple" Kira explained, summarising what Shiro was going to say

They heard footsteps down on the lower floor, to a staircase leading to the next level that opened after Puppy was defeated, and from it came several shadowed figures