Itadori Yuji and the time traveler

Sinopse:
Itadori Yuji, after the battle of Shinjuku, was on a mission in Osaka when he noticed the environment around him begin to distort inside the building. He saw a woman in front of him, and the last thing he remembers seeing is a flash that lit up the entire floor of the building, and then he was transported to the Heian era.