Total Recommendations: 1
If you liked
Boku no Kokoro no Yabai Yatsu
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...then you might like
Chiisai Boku no Haru
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both have the tall girl, short guy trope with the girl gaining an interest in the guy. both mc's work towards something. In chiisai... mc gets better at volleyball and is just a confident guy while in bokuyaba, mc is insanely introverted but gets much better as the manga goes along.