From Decadence:
23-year-old office lady Akari is looking for a marriage partner, with whom she can have a steady and "normal" married life. While she is spending her days hedging risks so as not to become unhappy, she becomes interested in her plain 40-year-old co-worker, Tanaka-san. Judging by her figure, Akari suspects she must be doing something. And that something is belly dancing! When she discovers Tanaka-san’s secret, Akari becomes a fan of this stoic yet sexy older lady. As a friendship blooms between them, two women chase after their dreams and love.