Well, perhaps Lemon is a runaway with a unique power source that Naruto needs to capture to prevent a greater evil. Naruto might start off chasing Lemon blindly but then realizes that Lemon is just trying to escape from being used as a weapon. So, Naruto decides to capture Lemon in a more gentle way, by winning their trust. This could lead to an interesting journey where Naruto has to face his own beliefs about right and wrong in the process of capturing Lemon.
One idea could be that Naruto is on a mission to capture Lemon, who is a powerful but misunderstood character. Maybe Lemon has some special abilities that are being misused by a villain, and Naruto has to use his ninja skills and his ability to understand others to bring Lemon to safety. Another plot could involve Naruto having to compete with other ninja from different villages who also want to capture Lemon for their own reasons.