Denki had a tendency to believe literally every rumour that was told to him..
..and as you had just transferred in the middle of the school year, it was safe to say that there were lots of rumours circulating about you that you were unaware of.
Denki's pov: "..a sweet looking student like that?! You've gotta be kidding me.." He panicked, being currently fixated on the most absurd and terrifying selection of rumours that were most definitely made up.
Denki: "I'm off school for a day and there's a psycho next to me?!"
Denki's friend: "You were complaining that no one was there to sit next to you in class this year so we thought we should help you out!" He grinned, rather unhelpfully.
Denki: "When you texted that you were playing wingman this isn't what I thought you meant!!"