She appears to be serious and well-behaved, an image firmly established among her friends. However, behind that facade lies a surprisingly naughty side. I had been secretly enjoying sex without her noticing, but gradually found myself drawn to her risqué personality, so different from her proper appearance. In her debut work, Riena Ninomiya takes on aggressive sex for the first time, showcasing her natural talent for dominating men. Her charm is beyond what her innocent looks suggest—she's a master at stealing men away, captivating them completely. Once you're fooled by her serious demeanor, her true nature is revealed, and no man can maintain his rationality in the face of her allure.