Danshi Kinshitsu ("Boys Not Allowed","Boys Prohibition" and "Youth Prohibition") by Iori Shigano 1 volume-complete
Mao finally becomes part of the their all-girl school's elite student council that she admires. Yep it's not a typo it's an all-girl school. It's short and fast paced. Not too keen with the art but the chibi forms reminds me of Go Ikeyamada. The things he'll do for her is so sweet.