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.
The motives could be many. It might be obsession. Maybe the stalker has developed an unhealthy fixation on the recipient, perhaps because of something they saw or heard about them. It could also be revenge. If the stalker feels wronged by the person in some way, they might use the mail to intimidate. Another possibility is mental illness. Some people with certain mental disorders might engage in stalking behavior without fully understanding the inappropriateness of their actions.
Stalker fiction is a genre of fiction that typically involves a character who obsessively follows or stalks another character. It often explores themes of obsession, power imbalances, and the violation of personal boundaries.
The books could be read in different ways in the horse riding and killing battles. A common method was to read the chapters in order. Each chapter represented the development of the plot in a game world. Another way was to read the story line so that one could better understand the relationship between the characters and the development of the plot in the game world. No matter which method he used, he had to read every chapter carefully, especially those important game plot nodes. At the same time, he could also understand the contents of the book through the hints and conversations in the game.
A character who could be the stalker is Gentle Criminal. He has that sort of flamboyant and devious nature that could lead him to stalk All Might out of some strange admiration or to prove himself as a worthy 'opponent'.
You might be able to find it on some dedicated manga reading platforms or websites. But be aware that some sources might not be legal or of good quality.
You could try looking on manga subscription services or even some fan-run manga forums. But remember, reading manga from unauthorized sources is illegal and not recommended. Always look for legitimate ways to enjoy 'Killing Stalking' if you can.