Dream About School Supernatural Investigation

This dream was about

So I was at a japenese school as always but today for some reason I was asked to come to meet my phisics teacher in the library. He told me that some horrible supernaturals were in the school disguised as students, teachers and random people and that they were killing a lot of people lately so he gave me some kind of weird machine that looked like a thermometer and suddenly disappeared. So after 3 long days I've had a bunch of adventures to find the imposters... oh and a little detail! My friends were killed by these monsters and I had to find them for that exact reason... It hurted so much to think that my joyful besties could die... So one day while I was in the hallway my machine started bipping like crazy! But it was my favorite teacher with some blood so I took my knife and confronted her but I didn't kill her I couldn't because she asked me for a favor... To come back home and have a dinner with her kids one last time... She was crying so I couldn't say no... But that same day, when I was walking home my machine started bipping like a maniac again?! I sighted and it was near that one nice girl's house: so I called some friends and faked a story so they could leave us stay the night. We had weapons of course... But they asked us to leave our backpacks outside! I mean who does that seriously?! Well then after a really fast check I was sure they were all the monsters it hurted me to kill my last friend but I had to... So I decided to act as if I was sick and fainted after telling my plan to the others of course they would rush outside then and instead of bringing medicine they would buy weapons or call 911 it depends if there's a weapon seller somewhere but that's it I woke up then...