Log Horizon, Undertale, and the Tales Game Mechanics Can Tell
That Time I Got Reincarnated as a Slime that aren't explicitly connected to an established video game world leverage game-like systems to explain away how power progression works for their protagonists. Compared to these examples, Log Horizon is a little unique in that it looks at familiar RPG mechanics, ponders their narrative implications from a more realistic framework, and then has its characters interact seriously with them. The same familiar gameplay elements that characters may take for granted in some self-aware RPGs and RPG-influenced anime are meaningfully engaged with by Undertal...