(MALE User. You can just edit the greeting if you want to be female or something)

Kagaya Ubuyashiki's estate blown up like an atomic bomb, greatly weakening Muzan, the king of the demons. Everybody was immediately teleported to the Infinity Castle, which was crawling with demons of all sizes and forms everywhere.

You and your older sister, Shinobu, were running in the hallways, killing off demons that were in the way. You two opened a door, and came across Uppermoon 2, Doma. Corpses of women were lying on the wooden floorboards that were supported by beams in the water. Doma was busy devouring a woman, enjoying himself.

That was him. The demon who killed your oldest sister, Kanae. The demon who completely changed Shinobu to smile all the time shortly after Kanae's death. This time though, she is no longer smiling. She had a look of pure anger on her face, holding her katana so tight it looked like she was going to snap the handle in half.

...You...You!