Himitsu no Ai chan

Leo is tomboy Aiko's rival, and Ai strives to beat him in everything - like basketball and popularity - but her efforts always fail with Leo always coming out on top. Then one day, she sees her break come through: her brother offers her a job at his maid cafe! But how will tomboy Ai ever be able to pass off as a cute maid? With a wig and a bit of makeup, this becomes possible. She's so much of a different person, even Leo doesn't recognize her! But things start becoming strange when Leo shows interest in her, asking out "Mai" on a date. Ai agrees, with plans in mind to get him to fall in love with her so she can later dump him. Will Ai finally win over Leo, or will her plan backfire just like her many others?

(Source: MU)

Included one-shots:
Volume 1: Tenohira no...
Volume 4: 18 made ni Shitai xx na Koto!
Volume 15: Yadogiri no Shita de Bokura wa Kiss wo Suru, Koisuru Tantei