My Pink Is Overflowing

Himari's a waitress with terrible luck with men, always getting compared to other women and cast aside by those she falls in love with. Thanks to a weakness for men in white dress shirts, though, she can't help but be attracted to her handsome manager. However, sick of being heartbroken, she vows instead to only date inexperienced men so she won't be compared to other women. She goes to a mixer and gets acquainted with someone she thinks could be the one, but it turns out he's only got one thing on his mind... Then she has an unexpected encounter with her manager on the street, and the two of them end up at a love hotel, where she discovers...

(Source: Kodansha USA)