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Even though I'm a virgin, if I reincarnate, I'll become a lewd demon!? [R18 version]

A college student, Yume, is excited about her upcoming trip with her boyfriend, Takumi, when she is unluckily hit by a truck and killed.
--When she wakes up, however, she finds a mysterious man, Kay, who calls himself a "whore" in front of her.
He tells her that she has been reincarnated as a succubus.
Yua is confused by this revelation, but she can't help but be convinced by the tail that has grown out of her and her strange appearance...
She has not yet had the first experience she has been looking forward to with the man she loves, but Kay slides his fingers on her body, claiming that it is "training for newcomers.
Her body is sweetly wet and writhing with pleasure, but Yua's heart, which cannot forget him, does not easily accept it....
What will happen to the girl's heart that wavers between "the whore's occupation" and "her feelings for hi"?
A sweet and sad triangle love story where Kei, Yua, and Takumi's feelings are intertwined!