Okay, these are a mix of little text errors and some suggestions on bits that just didn't sound right to me, feel free to ignore them if you like

Opening Intro
At the end "to see to the extermination of a simple monster hunt" perhaps "...a simple monster hunt" or "...extermination of a
monster infestation"
Conversation with Dean
"It appears that they have made the basement their headquaters" perhaps "... their nest" would sound better they are monsters
"So far, no-one's been hurt, but who knows when they'll appear again?" they didn't vanish, maybe "..when they'll emerge again?"
"Ah, my dear principal of Motavia Academy, how are you?" He is the Dean not the principal also titles should be capitalised like
names eg Principal
Molcum
Does Rune's description really require "crapload of technique power"? maybe " a technique powerhouse" would be a better
description
Tonoe Basement
"which uses it's paralytic attacks to freeze its prey" it doesn't use a paralyze attack it's a little misleading and as Alys is up on its
description maybe she would know that it "weakens it's prey with noxious gases"
Bioplant Errors
Alys says "Those ears...what on earth are you?And what is this place?!" why would she say what on earth? wouldn't it be Mota?
Hahn Says "Is is still functional?" Instead of "Is it....."
Rika Says "And it's thanks to these systems which control Motavia's soil" maybe replace "which" with "that"
Professor Holt ".....then howcome...." instead of "how come"
Rika Says "She is with Zio.And the name of that castle is
Zio's Fort!" saying castle and fort in the same sentence sounds awkward and strange perhaps this could be truncated to "She is
being held by Zio in his Fortress!"
Alys "And while we at it..." "while we are at it...."
If I come accross any more I'll let you know
