Usotsuki Ambivalence

Amamiya Ichika, a girl with excellent grades, has a rival she detests: the top-scorer and cold-hearted student council's vice-president, Kizaki Tsukasa. While Ichika is working hard at her part-time job, which is against school rules, Kizaki appears! Ichika introduces herself as Futaba to deceive Kizaki, but to think Kizaki fell in love with Futaba at first sight...

(Source: Hour of Lunacy)