After I stabbed the golem in the back, it crumbled into a pile of rocks.
"Wow, how did you do that? That was amazing, Onii-chan!" Iris exclaimed with excitement as she applauded me.
"Heh heh, thanks! I did some training beforehand, so I am stronger than I was the last time we met." I replied with enthusiasm as I rubbed the back of my head.
"Anyway, this is your first lesson." I said in a brotherly way.
"Eh?" Iris looked at me like I did nothing. "What do you mean, Onii-chan?"
"So look at what I did when I fought the golem. So who's faster, me or the golem?" I asked.
"You. But..." Iris said with suspicion.
"What does it have to do with your first lesson? It's easy. As you can see, the golem is larger than us. So, under normal circumstances, we are faster. Use that as an
advantage, and find its weak spot... Then, you can defeat larger targets with speed. To put it simple, your first lesson is: Go fast when you see larger targets."
"I see..."
"But remember, there are some cases where larger targets are faster than you. So don't get the misconception of all large targets are slower, got it?" I explained further.
"Yes!" Iris replied with the ingratiating smile on her face.
"Okay Iris, draw your sword." I told Iris as I pointed my sword at the another golem. "Go defeat a golem."
"No problem!" Iris drew her sword and charged towards the golem.
Twelve minutes later...
"I did it, Onii-chan!" Iris exclaimed happily as she returned to me without a scratch.
"Well done!" I said in the same tone as I gave her a headpat.
"Um, sorry." I apologized as I realized what I just did and moved my hand back.
"No, no! it's fine." Iris answered in a slightly panicked manner as she grabbed my hand and put it back on her head.
"Did I do well?" She asked proudly as if she did something big.
"Yeah... But..." I answered as I threw my sword at the golem's head, which also crumbles into a pile of rocks like before. "Can you do that?" I asked Iris with the same expression.
"I did it on purpose, show off." Iris said in slight annoyance as she pouted slightly.
"And that concludes your first lesson. Shall we head back to the Adventurers' Guild?" I asked Iris warmly.
At that evening...
"That was fun, wasn't it?" I asked Iris with an energetic demeanor.
"Yes!" Iris replied cheerfully.
"Hey Iris, before we head back to the Adventurers' Guild, let's head to the blacksmith first."
"Ehh? What?" Iris asked with a surprised expression.
At the blacksmith...
"Hey chief! You finished what I asked for?" I asked the blacksmith after I opened the door.
"Yeah! And this is..."
"She is Iris (Irisu), a student of mine." I answered nonchalantly as I handed him a bag of coins.
"Right this way." The blacksmith signaled us to follow him.
"This... is the Diver Knight." The blacksmith announced as he showed us a dark blue knight armor.
"Hey, Onii-chan."
"What is it, Alice?"
"What is that?" She pointed at the dark blue armor.
"That is a prototype for the Core System." I answered. "I will tell you the details when we get back."
"Yes! (Hai!)" Iris replied energetically.
"Anyway..." I extended my left hand at the hexagonal hole in the middle of the chestplate, which turns into an ocean green hexagonal crystal.
"Amazing!" Iris looked at me with admiration as I put the crystal into the Core, which disappeared in a flash.
"You might also want to take this as well." The blacksmith pointed at the smaller diving suit.
"Oh right!" I extended my right hand and turned the diving suit into a small dark blue cube.
"With all that, see you around then, chief!" I waved the blacksmith goodbye as I leave the blacksmith shop with Iris.
A/N: I thought the story would be full of spoilers, but it wasn't after all.
Hope you enjoyed the story! I will try my best to extend the chapters.
Positive critiques are appreciated.