Honki wo Dashita Onii-chan Nara Ishuuzoku Ojou-sama no Harem wo Tsukuru Koto Gurai Rakushou desu!

Everyone Will Fall for Me (All for My Little Sister…!) "Onii-chan, it’s time to launch Operation: Harem King!" For the sake of my little sister, Luna, I have to make every refined young lady fall for me. It’s my duty as her older brother to ease her worries, after all. My first target is Lili, the sheltered daughter of the Duke of Angefort. Known as the most breathtaking beauty among countless elves, she’s a genuine high-class lady from a prestigious ducal family. Her elven attire sets my heart racing, and her wild, unpredictable personality keeps me on my toes. Still, I manage to stretch out the sweet moments we spend together… —All of this is for my sister. No matter the race of the lady, I’ll make them all fall for me and build my harem, no matter what it takes!!! (Source: Kadokawa, translated)