Time: 8 pm, nighttime
Date: 31st october
Somewhere in Gensokyo
It's Halloween night in Gensokyo. But for some reason, ever places is dead silence, not even in the human village had their event activity. Elsewhere, a sudden sound of scream echoes through the forest of magic. A sparrow girl, Mystia is running away in fear as if she's being chased by someone or something. She cries for help until some object flew and stabbed her from behind. She fell down and coughed blood as she watching her very own life slowly fading. Finally, she is dead. The object that was stabbed her is a scythe. A figure slowly walks out from the shadows and retrieve its scythe. The figure was Kosaka, he is the culprit to why everything went silent. A gap opens beneath Mystia's body and swallows her before it closed on its own.
In every part of Gensokyo, there were a lot of dead bodies everywhere, whether it's youkais, celestials, gods, or humans. They soon also got swallowed by his gap. The question is, why did he commited a mass genocide? Well, it was all started since yesterday night. There was a large gathering in Hakurei Shrine for a game and drinking. Everyone was invited in the gathering and he was also there, but he actually got dragged by Marisa to join. In truth, he didn't have the intention to the game. Anyway, when they were having a mahjong tiles game, he purposely lost the game due to his nigh-omniscient intelligent considered as cheating. After he lost the game, he was asked to give away his katana to Youmu and M1911 gun to Nitori.
The shinigami Komachi was talking shit about him giving away his precious weapons to someone else. Yukari also gave a taunting sarcastic comment like " fufufu, I doubt he would kills us tomorrow." She and the others laughed at her joke and they drink their boozes again... But He took it personally and literally.
In the morning of 31st October, On the Sanzu River, Komachi was sailing with her boat until an unexpected gap opened behind her and a hand with sharp nails emerges and penetrated through her body. Blood pouring down as she felt her life slowly fading away and was surprised and confused how is she, a shinigami, dying. She looked behind and saw Kosaka with a stoic face staring at her from the gap. Fear started to consumes her as she knows that he could kill a death god like herself with ease. He then pulled Komachi inside along with her scythe before closing it and she was never to be seen again. After Komachi's dissapearance, Eiki was annoyed when she looked for Komachi everywhere.
She was started to worry a bit until she saw Kosaka in the distance with Komachi's scythe. She was confused why he holds her shinigami's scythe until she noticed that he covered in blood on his clotches. She was shocked and took a step back from his cold action. Rage began to fill her heart as she summons and fires her spell card at him and tries to end him as the judge of the dead. There was a lot of explosion when her spell card hits him. Once the smoke dissapated, he was gone from where he was. She took an immediate defensive pose and starts looking for any surprise attacks. But, it was too late when she felt a sharp and painful bite on her neck. It was him who bit her undetected. She screams in agony as she struggles and tries to use her hands but he immediately grabs on to it and rips off from her body. More screams could be heard from her and soon, he starts to eat her alive. A few moments later, She was finally dead and half of her body has gone. Another gap opened beneath her and swallows her before it closed itself.
More and more victims started to climb up and more witnesses had seen him commited mass killing upon everyone. The youkais, humans, gods, and everybody else were no match for him since he cannot be stop from reaching his goal and almost 1% of Gensokyo's population has been decreased in a matter of times in a single day. Back in the present time and elsewhere, Yukari is with a few survivors such as Reimu, Remilia, Kaguya, Sanae, Youmu, Nitori, and Alice.
