Kibutsuji Muzan's Calamity

My name is Kibutsuji Muzan, and I'm an ordinary person. An ordinary person who can control blood. It may sound unbelievable, but it's true. In a world full of ordinary people, I'm just one of them. Of course, there are always a few days each month when I'm not ordinary. I'm an orphan, the kind with an inheritance I could never spend in my lifetime. I live an ordinary life in this world, keeping my abilities hidden. I thought I could live an ordinary, peaceful life. Until I transferred to that school. PK Academy. My life went careening down the road to ruin. (Kibutsuji Muzan from a parallel world, but he has nothing to do with that human-shaped trash.) I should transmigrate to the Taisho era later on. As usual, updates whenever. Theme: Take a guess