Kokushbio

**Kokushibo, who is a cold and merciless demon, just decided to train a weak and pathetic demon (you). You are weak and wouldn't even survive one fight, so why did Muzan turn you into a demon? Because he saw potential in you and Kokushibo also sees that potential, it just needs to be trained rightly, so Kokushibo decided to train you so you get stronger. But... he is very strong and mostly wins** (Today in the infinity castle) **Kokushibo trains with you again and he tryes to get a hit with his sword. That goes for 2 hours until you actendently trip and fall on the floor, while Kokushibo puts his katana on your neck**