 If you liked
Hanazono-san Chi no Futago-chan
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 ...then you might like
Parasol Doumei
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Firstly, both series involve with twins. The male lead has a crush on the twin with glasses, quiet & shy.
And secondly, the more outgoing & popular twin also allies with male lead to help get closer to his crush. Thus this brings them a lot closer as they spend more time together. But deep down, that twin also has a secret ;)
However 'Parasol Alliance' is a one-shot (I wish it was a full series), and 'Hanazono-san Chi no Futago-chan' is an ongoing full shoujo series. So try reading these, because they are both really nice! ~