Toshi, an ordinary high school student, spent his days being fed and taught by a beautiful neighbor named Yuu-neesan, who lived near his house instead of his parents, who were rarely home. The older sister was kind and perfect as an adult. However, she has a secret. when she plays games, she becomes a totally different person...!? She\s not playing around! She rages, strips, and does whatever it takes to win! Toshi can\t handle her split personality! It\s gaming time with big sis, and things are about to get wild! Don\t miss this hilarious and sexy comedy!