Shungo Ninomiya is just an ordinary, run-of-the-mill high school student who lives at home with his older sister Ryoko—at least when she's not away doing her job as a mercenary. However, Shungo's life ceases to be normal the moment a cute girl named Mayu Tsukimura descends into the middle of his school's campus in a military-grade helicopter. It turns out Ryoko sent this girl, along with her older brother Mikihiro, to live at the Ninomiya household. But the newly-arrived siblings are a little special: Mayu is, in fact, a succubus and her brother, an incubus! And as if the circumstances are not problematic enough, Mayu is crippled with androphobia—the fear of men—and it's up to Shungo to help her overcome this at the behest of his sister. Ryoko plans to force Mayu to be closer to Shungo, and to do this, she’ll employ some questionable methods such as having them share the same bed and even take baths together. The situation further complicates when student council president Reika Houjou arrives as the new maid of the Ninomiya family, and she will stop at nothing to thwart Shungo and Mayu’s sexually-geared training. With the sudden arrival of all these oddities, Shungo's ordinary life is about to be thrown into utter turmoil. [Written by MAL Rewrite]

Hitotose Chitose was always alone and untrusting of people but when 5 female teachers appear and started living together with him in his family's house as his mothers, things started to change and pick up, together with Hazuki-nee and Minazuki (his 2 sisters) everyday is a lesson.

Alma Tandoji lives a lonely life. One day, Ruri Alba, a girl accompanied by her butler and maids, visits him. Knowing the power of Sacred Seven is latent within Alma, she asks him to lend her his powers. However, he refuses and drives her away since he injured many with his unusual strength in the past. Meanwhile, a fiendish Dark Stone creature suddenly appears in this peaceful town in the Kanto region. Only Alma's power of Sacred Seven can fight against it. But Alma just lets his power run amuck and things begin to get worse. Ruri raised her gemstone in order to release his true abilities, My Soul I give to you. With Ruri's wishes engraved in it, will Alma be able to defeat the Dark Stone?

Ever since their parents died a few years ago, Ryo and his sister Akane have been living alone together. Despite their difficult situation, they are still living reasonably happy and normal lives. However, everything is about to be flipped upside-down due to a secret government project. Due to increasingly low birth rates in Japan, the Japanese government is testing a program in which two young people are forced to marry. Ryo wants no part of it, but he is given little choice in the matter; his new fiancée, Shizuka, comes to his home late one night with several dozen government issued bodyguards, who are there to ensure the success of the new couple. Unlike Ryo, Shizuka couldn’t be more willing to go along with this new program, and eagerly goes about her wifely duties, despite his objections. With meddling friends, pushy bodyguards, and an overenthusiastic new fiancée, Ryo’s life has taken a turn in a direction the young man certainly didn’t expect. (Source: ANN)