Nanami Yua, who has never had sex with only someone she likes, has retired as a lesbian actress and nominated Hoshina Ai, who is currently on hiatus. Hoshina is perplexed by Nanami, who believes drinking the bodily fluids of someone she likes and the pain they inflict is a form of affection. The two, who candidly discuss their backgrounds as AV actresses, attempt to grow closer through activities like drinking urine, slapping, and strangulation, but the filming is interrupted... Nevertheless, they continue to face each other, in a close friendship that offers "Ten Promises for Happiness."