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…

“Welcome, please have a seat…” Sarasa says to Kira in her waitress uniform. Usually she would be much happier to see her brother/lover, but she can’t help but be tame while seeing the sporty, fresh girl, Kasuri, sitting next to him. Suspicious of those two, Sarasa makes her move not wanting to lose her lover. Hiding behind the blinds, she pushes Kira onto a sofa and smothers him with her tits. She puts her knee in between his legs and smirks as she sticks out her tongue…

“What is the meaning of this?” Sarasa asks as she pressed her large breasts against Kira’s head. Laid out in front of them is the results of Kira’s exam, and on it shows that he got second place in the school. But, “This is unacceptable. Everything but first place is meaningless. This is proof that that dumb bitch distracted you.”

Catching Kira coming out of another girl’s room, Sarasa gives Kira his punishment. She crawls in between his legs and snaps a condom onto his swollen dick.

Meanwhile, Kasuri is still getting the wrong idea. She thought that she had to be more aggressive so she called Kira to her club’s room. Her swimsuit hugging her petite body, she shoves herself with Kira into one of the changing room’s locker...