Neither I believe. Protagonist is a trainer and 1 heroine is new, while the other has some past with him but they're apparently not formal lovers in the traditional sense.
Reminds me a bit of Studio Ubai, especially with Kanami being positioned as the main heroine in case of a sequel I read somewhere. I'm not a fan of series though, so I hope that the plot plays self-contained and endings manage some form of romance.
Below are unedited Google machine translations of character profiles from the official website.
The protagonist. An employee and trainer at Club Rosebud. On the surface, he's an ordinary young man. Despite working in the illegal sex industry, his words and actions don't give off a frivolous or malicious impression, and he's caring, sincere, and moderately friendly towards the girls. This personality makes him a valuable trainer, and he's trusted by many of the girls working there. ...However, his inner self is quite twisted. He has a cuckolding fetish, and he finds excitement in watching the girls he's trained being embraced by customers. He has an inherently possessive nature and tends to become deeply involved with those he interacts with. He used to find this nature difficult to live with, but through his encounter with Kanami, it sublimated into the aforementioned cuckolding fetish. He has come to find his own way of dealing with it. While he genuinely wishes happiness for the girls he takes care of, he feels unparalleled pleasure in watching them being devoured by other men. A troublesome man who cannot be judged as either good or evil.
The sheltered daughter of a former company president. A beautiful girl with a gentle and soft demeanor. As the only conscience of her corrupt nouveau riche father, she was raised with overprotection, but with good manners and care, and miraculously grew up without any distortion. She possesses a fresh and glamorous body and the heart of an innocent and curious girl. To put it nicely, she is pure and innocent; to put it harshly, she is naive and doesn't know how to suspect people. However, she also has a surprisingly sharp and perceptive side when it comes to the nuances of people's hearts and emotions. Furthermore, she has a strong and straightforward core (you could even call it naive). She is always sincere and devoted to the things she faces, her responsibilities, and the feelings of others. Because she was raised away from anything impure, she has little sexual knowledge and didn't even know about masturbation. However, her body has a hidden potential for lust, and through Tsukasa's guidance, she awakens to pleasure, albeit with some bewilderment. Also, as the first young man with whom she deeply connects body and soul, she begins to feel love for Tsukasa... Because of her innocence, customers describe her as an "angel." Regardless of their partner's appearance or personality, they will lovingly stay close and devotedly support them to the end. And when it comes to the act itself, they will show such lust and assertiveness that they will take control without even realizing it.
The current top hostess at Club Rosebud. She is Tsukasa's "first woman" and his partner in both his personal and professional life, as an understanding partner who cooperates with his cuckolding fetish. She likes alcohol and hot springs. She is a carefree, easygoing, and freedom-loving airhead. Her words and actions give off a sense of unrestrainedness and playfulness, and she seems to be an easygoing and elusive person... but her true personality is a little different. To Tsukasa, who knows everything about her, she shows a serious side, a compassionate side, and an unpretentious cuteness. She has a beautiful face, but at first glance, she is not the type to have outstanding glamour. However, once she sets her mind to it, she is a bewitching woman who exudes an indescribable allure. She is exceptionally skilled at understanding desires. About two years ago, she came to Club Rosebud as Tsukasa's first special hostess, and became the one who gave him many "firsts." Currently, she lives a semi-cohabiting life with Tsukasa. While they don't bind each other with a specific relationship, they share a bond that transcends simple friendship or sexual love, and they deeply care for one another.
