7-Kakan Gentei Kanojo

A yuri romantic comedy about a limited-time relationship between a gyaru and an honor student. The story begins when Manatsu, a gyaru girl who is on the verge of repeating a school year, starts studying with Sumie, an honor student. Manatsu loves shoujo manga and love stories, but she feels vaguely that there is kind of a difference between that and having a boyfriend herself. When Manatsu suddenly brings up the topic, Sumie says, “Why don’t you just approach it from the practical aspect?” and then suggests, “Why don’t you try going out with me for 7 days?” (Source: natalie.mu)