Research Society for Improving Marital Life. Women who have never known the joy of sex are swept away by pleasure and given a sense of immorality as they betray their beloved husbands, which gives them a sexual excitement that makes it impossible for them to escape. Unaware of this, Azusa accidentally comes across the website of the "Research Society for Improving Marital Life." Through skillful guidance and training, she becomes addicted to pleasure, even as she struggles with self-loathing...