Yabai Kyoudai

Hina Mochizuki is a sexually uninhibited 19-year-old.
She worked part-time at a convenience store and lived off her body by selling it at men's houses. One day, her own brother, Chihiro, is released from prison after serving his sentence, and Hina goes to pick him up. Hina was reunited with her beloved brother, and together they went to Sapporo to prepare for a quiet life together. However, Chihiro is reluctant to make contact with Hina more than necessary, and Hina grows weary of her...?