The No. 1 younger sister-type idol girl 'Lucarina' takes on the role of four sisters who are slightly naughty and have different types! ! The serious and steady eldest daughter, the cool S-type GAL second daughter, the otaku third daughter who speaks the Kansai dialect, and the lively short-haired fourth daughter. "Onii-chan, can you promise not to tell anyone?" An incestuous love and sex drama about four overly perverted sisters approaching their shy older brother. A must-see for sister moe maniacs! ! !
