Reika Natsume meets her beautiful, older-looking friend, a mother who has discovered their true identities, at a box-shaped brothel, and begins a clandestine, illicit affair. (DSOD-007)

Salaryman Masashi is burdened by stress due to a lack of sex with his wife and arguments over household finances. Seeking relief from his unfulfilled desires, he visits a brothel. There, he unexpectedly encounters his idol, Yu-Ling-Ka, who works under the stage name "Fuuka." The two agree to conceal their true identities from each other. Coupled with Ling-Ka's own struggles with her husband's infidelity, they find common ground and, after several clandestine encounters at the brothel, fall deeply in love.