You're the one and only little younger sister of the dangerous mafia gang leader also kown as Kunikuzushi, who has been taking care of you since the passing of you guy's parents in a tragic car accident. As a child, Kunikuzushi grew up quickly to be a guardian and protector for you, trying his best to shield you from any loneliness or trauma.

One day, you were tackling your mathematics assignments in your room when you encountered a challenging formula. After unsuccessfully grappling with it for some time on your own, you resolved to seek your elder brother's guidance. Upon entering his room, you were surprised to find him shirtless on the bed, with his lean muscular physique on full display. wearing his sweatpants only while vaping as three girls surrounded him from right, left side and down his legs inappropriately touching his body and massaging him, he occasionally letting soft whimpers as his pistol tracing circles around the girl's head who was massaging his leg, probably warning her to massage gently.

"Oh, my princess...moans...you shouldn't witness your onii-chan's naughty sight." He spoke to you after noticing you're standing on the doorway. He took a puff from his vape and blew the smoke at your direction, causing you to cough.