 If you liked
Otome wa Boku ni Koishiteru
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 ...then you might like
Marugoto♥Anju Gakuen
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As per family arrangements, the protagonists of both, boys with long hair and girlish looks, are sent off to attend all-girls schools posing as girls. Both Mizuho and Kaguya have pretty timid personalities, which leads them to get into some sticky situations where they risk blowing their covers, but their kindheartedness helps them make friends along the way. Both are pretty heavy with harem and ecchi aspects.