Somebody should tell that guy that he has a much better shot at finding his handkerchief if he turns on the hallway lights beforehand. (Let's pretend they're just busted right now. :'D)

I searched for "sparkle screentones" because that seemed like an appropriate background to show that he's actually not that creepy - but they seemed pretty easy to make, so I just tried to do them myself!

A pale, older boy with long silver hair appears from the darkness, his sleeve, ribbon and mouth stained with blood. Kei gets creeped out and retreats, hiding behind Taku.

Kei: "Uwaaaaah!! G-Ghost..." Taku: "..."

But the silver-haired boy - Souma Tenshou - steps out into the light and makes an apologetic gesture while trying to explain.

Souma: "I'm sorry! I didn't want to startle you! I was just searching for my handkerchief. I knew I must have dropped it around here somewhere."
Kei: "Y-You're... not a ghost?"
Souma: "Not yet. Uh, I mean... I'm a transfer student. A living one, in case you're still worried."