Hello!! I've been looking for a certain old manga. I forget most of the plot but i know it is a really great manga and i want to read it again!!

I remember the it is about a boy and a girl who become step siblings and they end up falling in love w/ each other.
Then the boy move to the girl's high school and there is a popular tall girl (i think a year older) who like the boy. This popular girl senpai has date many time but dumped after fighting about the girl being too tall. So, the moment she see the main boy character who is pretty tall and handsome, she immediately fall in love.

I also do remember that there is one boy who is a little bit on naughty/bad side who has a crush on the main girl character. SO both the bad boy and the popular tall senpai try to mess with the step-sibling love relationship.

That's all, i hope you guys can help me. Oh, and it is NOT Marmalade Boy, i already know that manga and it isnt what im looking for.
Please help!! Thanks!!

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if its not in the list above, it might be Miyuki (its a shounen so it wasn't in the list above)