Slow Jet Coaster summary:

Honda Hiyori is a closet fujoshi who fantasizes about her two schoolmates, the cool and stoic Yamaguchi Rui and the bright and cheerful Niwa Ibuki, having a romantic relationship with each other. Day in and day out, she watches the two and posts her fantasies about them as BL manga on social media. However, the more she spends time with her bias, Rui, the more she finds herself slowly falling for him…