Reviewers from The Glorio Blog and Anime Corner noted that this episode fundamentally changed Keima’s character, showing that his feelings for reality began to shift despite his insistence that he only loves 2D worlds.
While there are three different "Episode 12" finales for The World God Only Knows (one for each season), the most discussed and impactful is the conclusion to the third season, the , titled " Memory of My First Love ". The Climax of the Goddess Arc The World God Only Knows Episode 12
If you were looking for the other finales, they vary significantly in tone: Reviewers from The Glorio Blog and Anime Corner