Hosuto ni 1500-man Mitsuida Watashi tte Baka desu ka?

Synopsis

"Five million yen in one night!?" When Kyouko finds out that her earnest best friend, Miyu, is hooked on the host club, she decides to join her to wake her up. With the help of Ryosuke, a handsome but unremarkable host, she'll expose the hosts for who they really are! Kyouko was determined to do so, but...? The sweet pleasure brought to her by Ryosuke, along with the swirling jealousy, was the beginning of hell - a rollercoaster romance based on a true story! (Source: Shueisha, translated)