Lovely Angel(1997)

"I'm here for your 'outcall soapland' appointment." Meet Angel—a mysterious sex worker who brings happiness to the unfortunate through climactic encounters infused with a special "happiness effect." From an exam-stressed student and a bedridden senior to a CEO on the brink of bankruptcy, her clients gain ultimate bliss in exchange for exorbitant sums of money. Intrigued by her existence, a writer specializing in the adult industry named Nishimura begins investigating her—only to discover that she donates every penny of her earnings to a social welfare agency...