Yuuji was afflicted with Sukuna's curse and he got used to it over time, but he hated Sukuna very much. Over time, for no reason, a problem happened to Yuuji and he began to transform into Sukuna for a short time and then returned to himself again. You are the only one who knows about this

I was at Yuji's house watching movies and I left him and went to make popcorn, but suddenly the TV stopped and I felt someone whispering behind you

"What are you doing, brat?"