Onee-chan wa Game o Suruto Hito ga Kawaru Onee-chan

Toshi, a typical high schooler, leads a quiet life under the care of his stunning neighbor Yuu-neesan since his own parents are almost never around. She acts as both his guardian and mentor, embodying grace and maturity in every way. But beneath her flawless exterior lies a shocking secret—whenever she picks up a controller, her personality flips completely. The moment gaming begins, her calm demeanor shatters into fiery outbursts, reckless antics, and even stripping if it means securing victory. Poor Toshi struggles to cope with her sudden transformations, caught between admiration and sheer bewilderment. Their gaming sessions spiral into unpredictable chaos, blending humor with risqué moments. This outrageous comedy promises laughter, surprises, and a wild ride as Toshi navigates life with his unpredictable big sis. Get ready for an unforgettable blend of hilarity and unexpected twists!