Homeward Visual Novel is not a virus. It's most likely a legitimate piece of software. Viruses have specific characteristics that this doesn't possess.
A 'homeward visual novel' might have a plot centered around the concept of homecoming. It could involve characters who are displaced or lost, either physically or metaphorically. The story might unfold as they strive to return to a place they consider home. There could be various obstacles in their path, like difficult terrains in a literal sense if it has an adventure - like setting, or emotional and social barriers in a more psychological or relationship - based context. They may meet different people during their journey homeward, and these interactions could shape their understanding of home and themselves.
In 'homeward visual novel', the main characters could include a traveler. This traveler is the central figure whose goal is to reach home. There may also be a guide - like character, someone who has more knowledge about the route or the world in which the journey takes place. Additionally, there could be a character from the protagonist's past, perhaps someone from their hometown who has a special connection to the idea of home and whose presence either helps or hinders the journey back. There may also be some antagonists, like those who try to stop the protagonist from reaching home for their own reasons, which could be related to power, jealousy or some other motives.
They can be incorporated by making the sister character the main protagonist who is on a journey homeward. Her thoughts, feelings, and experiences during this journey can form the core of the story.
One possible visual novel could be 'Sisterly Love: Homeward Bound'. It might focus on the relationship between siblings during a journey homeward, with engaging storylines and character development.
Look Homeward, Angel is considered romantic because it often explores themes of love, longing, and the search for a soulmate. The vivid descriptions of emotions and the way characters interact romantically contribute to this perception.