My Brother Fucked My Girlfriend Silly

Sumireko Murasakizuka

The only daughter of a karate dojo. She is very serious about karate and never skips training. She is also an upstanding and straightforward person. She and Tatsuro were childhood friends and are now lovers. They often trained together as children. She is strong enough to overpower most men with her karate skills. However, this leads her to believe that she has no feminine charm.

She likes to make clothes and plushies in her free time. She's into strong, manly men

Tatsuro Higuchi

Sumireko's childhood friend. They often trained together at the dojo. He'd always liked her, but believed that he wouldn't be worthy of her if he wasn't strong. He then devoted himself to his training, becoming strong enough to win several tournaments. He is now finally dating Sumireko. Her family recognizes their relationship and accepts him as her future husband.

He has a lot of stamina, but no sexual ability. He also has an inferiority complex about his lack of sexual prowess.

Ryoma Higuchi

Tatsuro's older brother. He is in college.
He'd always spent a lot of time playing around, but took things to the next level after entering college. Their father found out about his escapades and dragged him back home for summer vacation, forcing him to go to the dojo. He is a ladies' man and will have a go at most women, but never takes relationships seriously.
He has big dick bulging with veins, a fat shaft, and a huge glans.