There was this one manga which I think might be licensed but let's give this a go here. I first heard about this around Dec 2010 and it was fairly new back then. It's about this girl who dresses as her brother to attend a prestigious boys-only private school and meets these eccentric characters right off the bat. I think she had a toddler-aged baby brother at home but I might be confusing this with another shounen-ai manga with similar details. I recall that her family was not wealthy, though.

Last edited by maidenrose at 7:14 pm, May 3 2012

Could it possibly be Boku ni Natta Watashi, Hana no Kishi or Idol Shopping?

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I found it. It was [m]Houou Gakuen – Misoragumi[/m]
now back to looking for that yaoi manga set in a boarding school. The protagonist in that one had several young siblings.

Thank you for the suggestions, though~

Saa Koi in Ochitamae takes place in a boarding school and the uke has several young siblings including twins.

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