Main character priority

4 characters, two plots, and no matter what i hate how i paced it. I'm struggled with several plot points like

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that mirror doppleganger plot

and the characters believing the new teacher is kinda weird...

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as they turn out to be monster hunter

it's been awhile too but most of the plots i've done were just one continuous plot. this time around, i wanted to get my hands on doing two plots it seems....