From MangaHelpers:
Haruna Kotomi (25) is the receptionist girl with large breasts. It's been 2 years since her last boyfriend, but her current crush is the "Kurobuta Delivery Service" guy that drops off parcels at her company. Every time she meets him, she misconstrues everything he says/does to fit her fantasy. Will she ever be able to find her next boyfriend without revealing her embarrassing sexual fantasies?