Gokukano: Wakagashira no Hatsukoi wa Toriatsukai Chuui

Overview

She finds herself falling for this evil, beautiful man. This isn't love, it's simply lust. Kaoru, an office worker, has faced misfortune and is contemplating suicide. Then she meets Gai, a member of the yakuza gang, and, despite her fear, she turns to him for help. She learns that drinking makes her lustful... She's being blackmailed with erotic images taken by her ex-boyfriend... Gai listens to her sympathetically, and Kaoru opens up to him. But after he gets her drunk, he stares at her with penetrating eyes, and she feels aroused by his fingertips as they touch her body...!! She knows she shouldn't go any further, but she's irresistibly captivated. Where will her dangerous, erotic relationship with him lead...?! (Source: Shogakukan, translated)

Source: AniList