To relieve the fatigue of his daily transportation job... Our protagonist, Arata Satoru, frequents ear cleaning and massage parlors.

One day, he hurts his back at work and heads to a new place for the first time to seek help. He walks into a parlor called "Anriru" without doing his research... and it turns out to be a slightly erotic and unusual beauty parlor. And it seems...if the girls like you, they'll provide you with any kind of service.

Enthralled by the mysterious charm of the parlor and the girls, Satoshi starts frequenting the place regularly...

Translated from DLsite