Akina Hoshi, 25 years old. 3rd year in the workforce. She works hard during the week, but is lazy on the weekends. She's a natural. She's a slut. She's my step-sister. She masturbates 10 times a week. Episode 1. She has a very strong libido. Her big breasts make her tired, so she can't help but rest them on desks and chairs. She loves video games and anime. And this is in Kansai dialect. When her younger brother comes home depressed after not having much success with his job search, his older sister says, "Your shoulders are stiff, so that's why you're so negative! Here, let me massage your shoulders with my boobs!" Brother: "It has nothing to do with boobs." Sister: "This really works." This is a story full of over-the-top erotic developments, a little humor, and sloppy misunderstandings.