Good Luck! Ninomiya-kun

Shungo Ninomiya is an average high school student who lives with his older sister Ryoko-when she's not off working as a mercenary. But his ordinary life takes a sharp turn when a girl named Mayu Tsukimura lands in his schoolyard in a military helicopter. Ryoko sent Mayu and her older brother Mikihiro to stay with them, though the siblings aren’t exactly human-Mayu is a succubus, and Mikihiro is an incubus. Things get even trickier because Mayu suffers from androphobia, a fear of men, and Ryoko tasks Shungo with helping her overcome it. To push them closer, Ryoko resorts to extreme measures, forcing them to share a bed and even bathe together. The chaos escalates when Reika Houjou, the student council president, shows up as the family’s new maid, determined to sabotage Shungo and Mayu’s awkward training. With all these bizarre new arrivals, Shungo’s once-normal life spirals into complete chaos.