Kirino Kousaka embodies the ideal student with equally entrancing looks. Her grades are near perfect, and to cover her personal expenses, she works as a professional model alongside her best friend Ayase Aragaki, who abhors liars and all things otaku. But what Ayase doesn't know is that Kirino harbors a deep, entrenched secret that will soon be brought to light. At home one day, Kyousuke, Kirino's perfectly average brother, stumbles upon an erotic game that belongs to none other than his seemingly flawless little sister. With her reputation at stake, Kirino places a gag order on her sibling while simultaneously introducing him to the world of eroge and anime. Through Kirino, Kyousuke encounters the gothic lolita Ruri Gokou and the bespectacled otaku Saori Makishima, thus jump-starting an entirely new lifestyle. But as he becomes more and more involved in his little sister's secret life, it becomes that much harder to keep under wraps. [Written by MAL Rewrite]

Following an automobile accident that claims the life of his parents, Teppei Arima is taken in by his grandfather and introduced to the world of the rich and the elite. Compared to his humble upbringing, Isshin Arima's lavish lifestyle surprises and stuns the young teenager. In return for the gracious hospitality, Teppei is expected to continue the family business by replacing his grandfather as the head of Arima Financial Combine, and to prepare him for these responsibilities, he is enrolled into an esteemed high school. Along with his recently acquired celebrity status and affluence, Teppei is informed of an arranged marriage with the equally prosperous Sylvia van Hossen, thus, beginning the thrilling escapades of his new life! [Written by MAL Rewrite]

Just an ordinary teenager, Kobeni Yonomori receives quite the surprise on her 16th birthday—a fiancé and a sister-in-law she never even knew she had. As a result of an arrangement that her late grandfather made, Hakuya Mitsumine and his younger sister Mashiro have moved from their countryside home to the Yonomori household in order to deepen their relationship with their new family members. Mikakunin de Shinkoukei follows Kobeni's "love life" with Hakuya as she tries her best to adjust to the abrupt changes forced upon her. However, as some extraordinary secrets regarding the siblings come to light, Kobeni will find her life changed forever. [Written by MAL Rewrite]

Surviving a vampire attack, meeting several girls plagued by supernatural entities, and just trying to get through life are some of the things high school student Koyomi Araragi has had to deal with lately. On top of all this, he wakes up one morning to find himself kidnapped and tied up by his girlfriend Hitagi Senjougahara. Having run afoul of Deishuu Kaiki, a swindler who conned Senjougahara's family, she has taken it upon herself to imprison Araragi to keep him safe from the con man. But when Araragi gets a frantic message from his sister Karen, he learns that the fraud has set his sights on her. Along with Karen's troubles, his other sister, Tsukihi, is having issues of her own. And when two mysterious women who seem to know more than they should about Araragi and his special group of friends step into their lives, not even he could anticipate their true goals, nor the catastrophic truths soon to be revealed.