Gifted with both beauty and intelligence, honor student, Kisaragi Sarasa, holds back her swelling desires and nosebleeds as the day has finally come. Her younger brother, Kira, was admitted into the same school as her, and to celebrate, she invited him to her room, preparing to give him her first time. Not realizing this, he goes in not suspecting a thing. In her see-through negligee, she jumps on him and stares him down with her eyes full of lust and breasts showing.
“Kira, do me a favor, my bra hook is broken” Sarasa says with a large smile across her face as she barges into her younger brother’s classroom. Everyone staring at them blankly, they hide behind a curtain as they “fix her bra.” Her eyes gleaming with carnal desire, she grabs his meat stick and gets down to suck it, pretending she dropped something. Kira ends up cumming but is dissatisfied at what his sister just did. And like a fly to a lamp, Kasuri, who likes Kira, gets near him when Sarasa isn’t around. Peeing her pants, she uses it as a chance to have sex with Kira. Before Sarasa comes home, she uses the opportunity to stick his meat stick in her tight hole…