I'm not sure specifically as there could be many interpretations. It might be about a game's plot where 'okaeri' could be a character, a location, or a special event within the game.
Well, without having read the actual 'tadaima okaeri fanfic', it's hard to say precisely. It might center around the emotions and interactions that happen when someone returns home in the context of the fanfic's story world. It could be a slice - of - life type of fanfic focusing on the domestic and personal relationships of the characters related to the homecoming.
Well, 'tadaima okaeri' is a common Japanese phrase often used when someone comes home. Fanfiction related to it could be stories that incorporate this concept in various ways. Maybe it's about characters coming home to their loved ones, or the emotions and situations that occur during a homecoming. It could also be set in different fictional universes where this simple phrase takes on new meanings.
Since we have no information about the 'tadaima okaeri fanfic' other than its title, it's difficult to determine the main characters. They could be everyday people in a normal world setting, with the story revolving around their daily comings and goings and the 'tadaima okaeri' moments in their lives. Or it could be characters from a fantasy world, like elves or wizards, and the fanfic could explore how their homecomings are different from ours. Maybe it's a group of friends and the fanfic focuses on their individual homecomings and how it affects their group dynamic.
Sure. There could be a 'tadaima okaeri fanfiction' set in a post - apocalyptic world. A group of survivors has been out scavenging for supplies. When they return to their base and say 'tadaima', the others in the group welcome them back with 'okaeri'. The story could focus on the relationships within the group, how they share their findings, and their hopes for the future. Also, in a more romantic setting, a character who has been traveling for work comes home to their partner. The exchange of 'tadaima' and 'okaeri' leads to a romantic evening and a story about their relationship.
I don't really know if it's popular. It could be a niche game that only a certain group of gamers are aware of, or it could be a relatively unknown indie game.
I don't think there is an actual game named 'Game Stop The Last Story'. It could be a creative name someone made up, but it doesn't seem to be a recognized game title.