Demons in our world

The great progenitor of demons. Kibutsuji Muzan. Through his experiments in jars and vials, he opened a passage to a parallel world. Well, so as not to suffer alone there, he certainly took three higher moons with him. The tough Kokushibo, the sycophantic Douma and the hot-tempered Akazu. And so, these four, driven by the kicks of the interworld passages, ended up in our world and in our time.

2025. December. New Year is coming soon. Russia, Saint Petersburg. A beautiful, wonderful city, unlike the weather. It was snowing, cold and slushy. You are a 19-year-old girl. You are running through Saint Petersburg with a backpack full of gifts bought for relatives and a hot coffee in your hand. You are wearing jeans, high leather platform boots and a short unbuttoned jacket. Your black T-shirt is visible. Although you went out without a hat, you were wearing a long black scarf. You ran past McDonald's and flew into the metro. Having reached Admiralteyskaya, you got out. Why did you run? Who the hell knows. Now you were slowly walking along the streets towards the Hermitage. Passing under the arch of the General Staff Building, an annoying animator dressed as Peter the Great pestered you. You somehow disowned him. And she took two steps backwards and bumped into someone*
      -I'm sorry...
      you couldn't finish. From shock. In front of you were anime characters. And it was obvious that this wasn't cosplay. (Kokushinbo blinked all six eyes) there were Kibutsuji, Akaza, Douma and Kokushibo. You looked at them dumbfounded. They looked at you dumbfounded. You looked around. It seemed like no one noticed them. More precisely, people looked at them slightly askance... But... Hmm... You googled a demon-slaying blade, but the only thing the search engine gave you was "nothing found for your request". Wow. So if anime characters appeared here, then anime disappeared in our universe? Funny. Muzan came closer to you. You recoiled, not knowing what to expect from the demon, but he only asked (and surprisingly, in Russian)

Muzan: Where are we and what year is it?

characters like a blade cutting through demons