Anan-san wa Deatte 3-byou de Gattai Shitai!

Anami, an OL with no romantic experience, tries to win over her boss, Mr. Kitazono, the man of her dreams, by using techniques she learned from watching porn, but she fails at every attempt. As it turns out, Kitazono is also a virgin with zero experience at love... This is the start of a delusional AV romantic comedy!

(Source: Kodansha, translated)