 If you liked
Watashitachi no Tamura-kun
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 ...then you might like
Megane x Parfait!
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Although the two manga have completely different settings, both have a similar premise in which the main protagonist has someone they are in love with, but are introduced to a new love interest. Also, Both manga are shounen romances involving a love triangle, but one manga has a male lead and the other has a female lead. Finally, the plots follow an extremely similar trend, so if you liked one, you'll like the other.