- Modern world
- Game-like world
- Reverse time
- (I can't remember ranking system, but I think it's levels)
- Modern world
- Return from alternate dimension with time difference (abyss)
- Constellation
- Became constellation
- Dungeons
- Letter ranking
- Modern technology
- Dungeons/tower
- Levels
- Modern technology
- Tower
- Reverse time
- Stats-based system
- Modern person in alternate world
- Tutorial
- Level
- Modern world
- Tutorial
- Dungeons
- (I can't remember ranking system)
- Modern technology
- Individual-strength-based discrimination
- Focuses on relationships, not strength
- Letter ranking
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