It depends. If the portrayal of the yandere girlfriend is done in an interesting and nuanced way, it could be appealing. But if it's overly stereotypical or one-dimensional, then no.
A gift from her in a yandere manga can have multiple meanings. It could be a sign of the yandere's obsessive love, an attempt to control the situation, or a way to create drama and tension in the story. Sometimes, it might even be a red herring to mislead the reader.
Well, such a girl is often obsessive and possessive. She might go to extreme lengths to keep the person she likes close to her, sometimes even using violence or threats.
Jedi Dive 2 broke the record for the number of online players for a first-party game on Steam, with 119,117 people online at the same time, surpassing the peak number of online players for God of War 4, Marvel Spider-Man: Remake, and Horizon: Zero Dawn. In terms of sales, Hidden Warrior 2 continued to grow three weeks after its release, breaking the norm in the gaming industry. Industry analysts described its sales performance as "a real inverse decay curve" and rated it as "very amazing." This kind of sales trend was very rare in large-scale games, especially when there were no major content updates or promotions. Overall, Hidden Warrior 2 had achieved remarkable results in terms of sales and online viewers.
Another sign is over - monitoring. In many stalker friend stories, you can see that the stalker friend constantly checks your social media, texts you too often, and seems to always know what you are doing. For example, if you post a photo on Instagram and within seconds they comment with details about where you are or what you were thinking when you took the photo. It's a bit scary.
Perhaps it's a neighbor who has some sort of mental illness. They might have developed an obsession with the main character for no clear reason. They see the person through the window and start to stalk them, seeing them as an object of their strange fixation. Another possibility is that it's a criminal who has randomly chosen the house to target. They might be casing the place for a robbery, but their presence in the window makes them seem more like a stalker.