Reverse Journey: Starting from Naruto

He once formed a seal in the world of ninjas, transformed into a giant bear under the moonlight of Azeroth, and drank a bottle of wine in an unknown river and lake. Every time he died, he woke up in another world. He thought it was a gift from fate and that he was a traveler traveling through the heavens. Until one day, he heard the beep of the instrument. The sound was very far away, as if coming from deep, deep water. He suddenly remembered a question—— If the whole world is false, then who is the "I" who is thinking about this problem?