FL was tricked by her friend to be his guarantor and he fled with the money he loaned. The ML is the yakuza whom the trash friend of the FL owed to and now he’s asking for the payment. FL doesn’t have enough money so the ML offered another way to help with the payment of debt. Sex.
You may feel your favorite manga should be gathered together into distinct categories for your own reference and, now, you can do this with a LIST. After you've created your list or lists, you can proudly recommend them to other manga fans to showcase and share your taste in manga.
Koi to Dangan