Yuri No Hajimari Wa Dorei Kara summary:

Chiyoko Hanamura, a self-proclaimed *gyaru* who failed her high school debut, was skipping class as usual on the rooftop when her junior, Sakine, approached her. It seemed like Sakine had a favor to ask, as she handed Chiyoko a love letter."Could you turn down this confession for me?" she asked. However, the sender was unknown.For the sake of her adorable junior, and to maintain her *gyaru* dignity, Chiyoko resolved to take on the task and went to refuse the confession...