Goku to Tsubomi: Gokudou to Koi wo Shiranai Hitozuma to

After witnessing her husband cheating on her, Sari impulsively meets a man named Tsukumo at a bar and spends the night with him. Worried about her mother-in-law urging her to have a child and her husband lying to her, Sari ends up meeting Tsukumo again. Sari is drawn to his casual kindness, but when she sees the tattoo on his back, she learns that he is a yakuza. Although she knows she should keep her distance from Tsukumo, Sari gradually finds herself drawn to him... An immoral love story unfolds between a housewife who has never known love and a gangster with many secrets.

(Source: Natalie, translated)