 If you liked
Kimi ni Todoke
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 ...then you might like
3D Kanojo: Real Girl
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Both of these series feature outsider protagonists coming out of their shells through the development of a romance with a more outgoing significant other, with 3D Kanojo: Real Girl showing an introvert male paired with a more extroverted girl. Whereas Kimi Ni Todoke was an inversion of that formula featuring an introverted girl with a more extroverted boy. Both shows address social pressures and anxieties in regard to high school/developing young love with charming characters and compelling melodrama that immerses the viewers in their ongoing development.
These anime are sure are entirely different even though they are highschool- romantic-slice of life, but they give off a similar vibe. 3D kanojo goes into the characters' future lives and is more touching than Kimi ni Todoke in the end, where Kimi ni Todoke has a similar vibe throughout the whole anime, sure it gets Doki-Doki in the end, but it manages to have the same vibe throughout the series.