Corpse Party: Killing Harmony

Prologue

Warningggggsssssss.

Graphic blood/violence/gore.
Child murder.
Child kidnapping.
Murder.
Sexual harassment (referenced).
Suicide.
Possible emetophobia triggers.
Characters have merged personalities between Danganronpa and Corpse Party, meaning: they're not canon.
Love triangle? Nah. Love dodecahedron.

I've tried to use Corpse Party canon lines where I could with minor changes.

Rantaro and Yuka are siblings. Rantaro will be called Amami, and Yuka will be called Yuka (unless speaking. Then honorifics will be used. Same with Sachiko and Yoshie). Just to avoid confusion.
Speaking of Yuka. You are getting no 'peeing in the bucket' moments in this crossover. I'm not writing that. Also, no incest love either. Yuka is a good girl.

~~~~~~~

"On a night like tonight, rain barrelled from the skin... A sweet, kind teacher lost her footing and tumbled down the stairs. She fell, and she died. You've all heard the stories, I'm sure. There was another school on this property, one before Kisaragi Academy. Heavenly Host Elementary School. Such a horrible thing to happen... 

It devastated the principal. He cared for Heavenly Host almost as if it were his child. After the incident, one thing led to another and, ultimately, a decision was reached. The school was to cease operation. The principal - stricken with grief over losing his precious child - climbed up to its roof and threw himself to his death on the day of its closure.

Heavenly Host gained a haunted reputation. Many deaths occurred there, the principal was just its latest victim. That's why it was torn down in the end. However! They say the teacher who fell down the stairs still has no idea she's dead, even to this very day. She still walks these halls on rainy evenings, believing them to be the same ones where she died.

Ah! It's seven o'clock! Almost time for her to make her rounds! A sudden blackout accompanies her, leaving the entire school as dark as night. You'll hear a knocking from the darkness; followed by the slow creak of an opening door. Her pale, white face materialises in thin air, her soft voice echoing the same question every night: 'Is anyone still here?' And then..."

Thunder boomed around them, making Amami Rantaro yelp in fear. The six other students sitting in a circle began laughing as the green-haired man sighed in embarrassment. "Who thought it'd be a good idea to tell ghost stories?!" Despite appearing calm no matter the situation, Amami hated anything horror-related.

"Not very manly," Iruma Miu cackled. She sat atop a classroom desk, all of which were haphazardly pushed to the walls after the school's culture festival. At least it left the perfect space for everyone to sit on the wooden floor.

"Hey!" Ouma Kokichi huffed, pouting as he crossed his arms. "It's okay for men to be scared! Even though Amami-kun's a big baby," he added with a chuckle.

"You have the best reactions, Amami-kun!" Akamatsu Kaede laughed. Amami grumbled and rolled his emerald eyes.

He jumped when the classroom lights flickered off, the room only lit by the flickering candle sitting before Ouma. The entire room fell silent as students looked around at the walls, shadows coming to light with the amber candlelight. Three slow knocks sounded through the room, making every student jump and turn to the closed classroom door. They dared not speak, heartbeats cracking their ribs in terror. "Is anyone still here?" A feminine voice whispered. Goosebumps washed over everyone as their eyes widened.

Iruma began laughing and stretched out her leg, only just managing to shove Ouma with her black shoe. "Good prank, dick weasel. Got me good for a minute, but nothing can trick the gorgeous girl genius!"