 If you liked
Diamond no Ace
|
 ...then you might like
Ansatsu Kyoushitsu
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Both feature main characters who are seemingly weak or untalented but then eventually find out that they have a unique talent that they learn to polish throughout the series. Furthermore, both have a sort of rival aspect between the seemingly untalented main character and another character the same age as them who everyone previously thought to be perfect (Nagisa v Karma, Sawamura v Furuya).