Renaiondo, Joushouchu!

Saori is a lingerie designer, but she is neither particularly sexy nor good with men. The president of her company tells her to get some romantic experience, for the sake of better design, but she is too stubborn and timid to take the plunge… Then one day, she meets Sekiya, a rude but handsome man at a bar. When they share a cab ride home, he kisses her out of the blue. Then at the urging of her junior colleague, Saori ends up going on a date with him. Saori's calm mask is on the verge of cracking at his aggressive approach…!

(Source: Berry's Books, translated)