Zettai ★ Imouto Genri Shugi!!

As the sole brother and heir to the family dojo, Takuma strives to lead by example for his four younger sisters, training hard every day. But one day, the eldest sister Mizuki suggests tearing down the dojo to build a store instead. The other girls quickly agree, igniting a battle between him and his sisters for the dojo's fate. To win him over, they plan to seduce him relentlessly. Can he resist their advances—and his own primal urges—to preserve the family dojo? From Hau~ Omochikaeri!