From Midnight Scans:
After my Mom got married to her second husband, it made Chinatsu my younger brother. At first, I thought he was surely a perfect brother after seeing his angel-like smile, however, the truth is that he is really a pervert and very ill tempered! I was surprise when I found out my angel-like younger brother is really a little devil?! Will I just allow him to abuse me?!
Koakuma Kiss (Kiss by the Small Devil)
Motto Koakuma Kiss (Kisses by the Small Devil)
Motto Motto Koakuma Kiss (More and More Kisses from the Small Devil)
Koakuma kiss -Again- (Kiss by the Small Devil -Again-)
Kimi no Junjou, Otome no Jijou (Your Pure Heart, Maiden's Situation).