Dakaretai Onna: JD dakedo Around 30 Joshi ni Kawareteimasu

Karin's boyfriend is an older working man. She doesn't have the money to buy him a birthday present, so she turns to papakatsu (sugar-dating) to make some money fast. Nervously waiting at the rendezvous point, her first sugar-daddy turns out to be Izumi, a thirty-something married woman who wanted to be a sugar-mommy to a younger girl. Karin feels guilty about doing this behind her boyfriend's back, but she tells herself that it was just dinner...? But before she knew it, Karin and Izumi are going to a love hotel. An innocent college girl falls into a money-tainted love trap...

(Source: Shogakukan, translated)