Kurumi Kokoro (小衣くるみ) is a Japanese AV actress, previously known as Yui Serizawa (芹沢ゆい). Born on November 15, 1991, she stands just 148 cm tall with measurements of 90(J)-60-85 and blood type AB. She debuted in January 2011 with Alice Japan as a petite J-cup performer and later re-debuted under her current name in 2013. Active mainly from 2011–2014 and again from 2019 onward, she is best known for the striking contrast of her short stature and soft, heavy breasts. Her work frequently focuses on breast-centric scenes, especially paizuri and dynamic breast movement during sex.