Naruto: Why Did He Become a Girl at the Beginning?

After traveling through time as a newly graduated Konoha genin, Lin Yue had not had time to adapt to the ninja life of "being able to roll balls and throw shurikens". When he opened his eyes, he discovered that there was a big problem with his body - the original figure of a boy became a slender girl, and his ninja bag had to be resized! What's even worse is that he not only has to deal with the D-class missions that are coming one after another in this unfamiliar body, but he also has to hide his secrets under Kakashi's "death gaze" and the curious scrutiny of his teammates. He is even occasionally mistaken for a "potential newcomer" by a passing Jiraiya and handed over strange flyers. From being forced to learn how to tie his hair and adapting to the embarrassment of fighting in skirts, to gradually using his "girly" appearance to break the enemy's expectations and stunning everyone in the chunin exam, Lin Yue (should he be called "Lin Yue" now?) Just wants to shout: "I really just want to be a ninja, not to experience the gender-displaced version of Hokage's life!" But when the crisis comes, this unexpected body seems to hide a secret that even he himself does not know, and his bond with Naruto, Sasuke, and Sakura also quietly moves in a completely different direction in this ridiculous "misplaced life"...