A secret lesbian relationship between a sister-in-law and a gal unfolds in a house... RISA, an esthetician who has moved to Tokyo to change jobs, ends up staying at her brother's couple's house until she finds a new job... One day, thank you for your help. As a way of thanking him, he gives his sister-in-law "Luna" a massage, but it ends up stimulating "Luna"'s erotic switch...
