Kyaba-kura-jō: Shibori dasu yubisaki (2007)

Teacher Akagi, along with his colleague Hisamoto and others, goes to a hostess club while drunk. It's Akagi's first time at a hostess club. He's assigned to Sayuri, the club's number one hostess, who is very friendly. Feeling at ease with Sayuri, Akagi exchanges email addresses with her before leaving the club. At home, Akagi feels neglected by his wife and daughter, and his sex life with his wife is dull. Two weeks later, when he's almost forgotten about her, he receives an email from Sayuri, and feeling bored with his daily life, he impulsively heads to the club...