 If you liked
Hirunaka no Ryuusei
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 ...then you might like
Dramatic Irony
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Both are centered around the main girl that falls in love with her teacher and she is trapped in a love triangle. While HnR is softer and comedic, Dramatic Irony takes the story a bit more serious, with many sad scenes. The art-style is beautiful in both manga.
Shishio is similar with Natsuo, but Chihiro's personality is parallel with Mamura's.