The Most Beautiful Mistake

When the poor but clever girl, Saia, is afforded a scholarship to the most famous school in the country which is attended only by the richest and the most important people in the area, she feels very happy for her achievement. However; when one mistake leads all people around her to think that she's a boy without her even knowing that, she finds herself sharing a house with three strange different boys. The isolated but kind character, Reyo, who cares for nothing but has many admirers at school. The less-clever student, Tadashi, who is very sociable and is fond of the poor. And the dominating popular student, Kyoya, whose only enemies are girls—especially poor girls.
Between comedy and adventure, how would this story come to an end?