The plot could involve Ino's yandere tendencies causing trouble within the Hidden Leaf Village. Maybe she uses her mind - transfer jutsu in a more devious way to keep tabs on Naruto. She could even manipulate situations to make Naruto rely more on her, like making him think he's in danger when he's really not, just so she can come to his rescue and prove her 'worth' to him.
Naruto might be initially confused. He's used to people being friendly, but Yandere Ino's possessiveness would be new to him. He could try to talk to her to understand what's wrong. But if she gets too extreme, he would probably be a bit scared and try to distance himself.
In the fanfiction, their relationship could develop in a rather chaotic way. Ino's yandere nature would cause her to eliminate any perceived threats to her relationship with Naruto. She might see Hinata's gentle glances at Naruto as a threat and try to make Hinata look bad in Naruto's eyes. Naruto, being the kind - hearted person he is, would be confused by Ino's sudden mean - spirited actions towards his friends. This would create a rift between them, as Naruto values his friends and wouldn't understand Ino's motives.
One plot idea could be that Yandere Ino becomes overly possessive of Naruto when she sees him getting close to other female characters. She starts to secretly sabotage his friendships with them, like spreading false rumors. Another could be that Yandere Ino tries to use her mind - transfer jutsu on Naruto to make him fall in love with her. And a third idea is that Naruto initially doesn't understand Yandere Ino's extreme behavior until it starts to put him and his friends in danger.
Naruto might be really confused at first. He's used to people being friendly or having normal crushes, but a yandere is a whole different level. He'd probably try to talk to her and understand why she's acting so strangely.
In a Naruto and Ino friendship fanfiction, they could bond over their shared experiences in the Hidden Leaf Village. Maybe they start off as just classmates, but as they face various challenges together, like during the Chunin Exams, their friendship deepens. They might support each other's dreams, with Naruto aiming for Hokage and Ino wanting to be a great kunoichi in her family's flower shop business. Their different personalities, Naruto's exuberance and Ino's more headstrong nature, could lead to some interesting interactions and comical moments as they grow closer.
In a fanfiction, Naruto could be training in a secluded area and Yandere Koneko stumbles upon him. She immediately falls for his spunk and the fact that he doesn't give up easily. Yandere Koneko then tries to insert herself into Naruto's life by bringing him food and small gifts. Naruto is initially confused but then realizes she has a rather extreme way of showing affection and has to gently set boundaries.
One idea could be that Naruto somehow gets trapped in a dimension where Kaguya has become a yandere for him. She tries to keep him there all to herself, while Naruto has to figure out a way to escape and also deal with her obsessive behavior.
Naruto might also feel a sense of responsibility. He might think that he did something to cause Yugito to act this way. So he could start to limit his own actions to avoid triggering her yandere behavior. For instance, he might stop being so friendly with other girls in front of her. But at the same time, he would not give up his own dreams and values, and would try to make Yugito understand that her behavior is not acceptable in a way that is both firm and kind.
At first, Naruto might be really confused. He's used to the normal Sakura, so when she starts acting all yandere, he'd be like 'What's going on, Sakura - chan?'. He'd probably try to talk to her and find out what's wrong.