Danshi Kinshitsu!!

Danshi Kinshitsu!! summary:

From Intercross: Starting today, Shimomura Mao, who goes to Shirasagi Academy for daughters of super rich families, becomes a member of the student council, "Shirasagi Council". Very soon now she'll be able to meet the president, Kiryuu Chisato, who she's been admiring for a very long time! When she opens the door to the student council room with her heart beating wildly...kyah! Guys is changing clothes!?