[ENGLISH-SUBTITLE] STARS-469 Hibiki Natsume, a super-care-grilled sister, answers all the worries of her younger brother Kun's phimosis.

"I want to wash my brother's phimosis with bubbles" "I want to test how far my brother's phimosis skin grows" "I want to measure the size of my brother's phimosis" "I want to strengthen my brother's p