Typos and stuff
Performing arts and art alike, I always seem to have a neck for that.
knack
Now that I had a better look, her lavender hair didn’t seemed to look as bold or outrageous as it did a few seconds ago.
seem
“You aren’t very bright aren’t you?”
are
While I did believed what she said was true, my mind couldn’t help but drift into it’s own trance of thoughts.
believe ; you shouldn’t use past tense after did
Certainly wasn’t just a window… it sounded as if a whole building had came crashing down and the thousand of glass broke simultaneously.
remove ‘the’
thousands
glasses
I couldn’t help but stumbled on my own feet.
stumble
Her grip seem to have stopped my fall. She’s surprisingly capable.
seems
Her pure pastel hair tainted with tinged of maroon from the now crimson ambiance.
a tinge
The impossible have just happened right in-front of my own eyes. It’s all so… surreal
has
Even from far, I caught a whiff of it horrendous stench and its odor was enough to make me nauseous
it’s
It seems to had left trails of sludge whenever it moved.
have
Mucus coated the red ground as it made it way to us.
it’s
The adrenalin flew over my veins like a carp through the river, but I couldn’t move a single muscle, not even to scream.
adrenaline
She didn’t seemed to be talking to me. So WHO was she talking to?
seem
The texture of its skin were oozing with slime, its “face” was twisted into something I wouldn’t recognize, the only feature I seemed to be able to make out is it’s mouth.
was
was
“Great to officially meet you.” Her smile will huge, like a girl who just got a new doll, or a kid in a candy store.
was
I tried to paced back, I remembered arriving at the train station, I remembered that bright lavender hair, and it hit me, I remembered the monsters, the hideous monsters that was haunting my dreams.
pace
Oh, her. I didn’t realized I didn’t even know her name till now.
realize
She giggled, it didn’t sound like an apologize, not at all.
apology
She said Reverie, what did she meant by that? A sharp pain jolted my head, I remember seeing a giant man, I rememebered passing out on the crimson floor.
mean
remembered
His eyes were full of curiosity, her hair was tied to the side, she had a big smile.
Coding error should be ‘her’
For years, I’ve been looking for my life purpose’s since my baby feet stepped foot in the world.
life’s purpose
These practices weren’t just to prepare for common school plays, they were professional training for the performing arts.
for performing the arts
Or
Remove ‘the’ altogether
High expectations? What did she meant by that? Tsubasa and I were entrusted to scout the upper sections of the mall.
mean
Direct them out of the portal will be our priority, defeating the Whims and closing the Somnium, secondary."
Directing
We all nodded, agreed with Tsubasa’s orders. Looking over to Sibyl, she was carrying a weird contraption on her tiny back.
nodded in agreement ( would be better fitting)
“You see, I figured out why the communication devices I made was not working.” She explained further
were
I caught Tsubasa looking at some dresses that was on display, so she’s a normal girl after all.
were
Also can I offer to buy one for her? +brownie/relationship points would be rewarded maybe
Sibyl sure weren’t kidding when she said Tsubasa was strict about our Academic achievements, even at a time like this, she was asking about my school work
wasn’t
You seem like you’re use to this.
used
I felt like a kid who had just gotten a 100 of his test. I wasn’t complaining, her hand was soft and full of life, he hot and cold personality was sometimes outputting, but I knew she put up a tough front for us, she was our fearless leader afterall.
the
I was frozen in place, my legs couldn’t move. I felt Tsubasa pushed me, I stumbled back and watched Tsubasa fell as the floor crumbled beneath us.
push
fall
Is it weird that I really like Tsubasa. and he was also reading one of my favorite books! 
Also regarding jobs, I didn’t really, not like them but don’t have a strong opinion about them either, you could follow up on the “jobs” in later chapters to make them not seem like filler…