After the death of their parents, Akito Himenokouji and his younger twin sister Akiko were adopted by separate families. Six years later, they now live on their own, under the same roof. Akiko makes no effort to hide her brother complex. She even goes as far as trying to convince her brother to make their first night together a memorable one, to no avail. Akito calmly rejects his sister's many advances and deems loving his blood-related sister impossible. However, Akiko is determined to prove that love can overcome any obstacle.

In a hidden school surrounded by mountains, young ladies of good families are taught everything a high class lady needs to know. They are also completely cut off from the outside world, keeping them sheltered and innocent. However, a problem has come up recently-- more and more graduates are failing to cope with the modern world after graduation. To deal with this problem, they've decided to kidnap a male commoner student, and enroll him as a student. They hope that this will be a gentle way to introduce the girls to the outside world. Kagurazaka Kimito is chosen for this dubious honor, mostly because he seems utterly average. However, the school leaders also seem to have concluded he's a homosexual with a muscle fetish. When Kimito hears that the alternative may be castration (to protect the girls' purity), he eagerly plays along with this misconception. Now he'll just have to survive the attention of many high class young ladies that are completely out of touch with the world! (Source: MangaHelpers)

Shinozaki Himeno has no intention of dating anyone before she's ready to consider marriage; as such, the last year of high school is too early to her. However, she is confessed to by Murayama, a weirdo who asked her out solely because a friend told him he should try out love. Moreover, he asked to date her for only one month. Since he'll ask someone else if she rejects, Himeno begrudgingly accepts, beginning an unusual relationship.

Seiji Harada usually avoids girls due to the fact that he believes that they are the source of all problems. As he enters his high school years, he is forced to join an all-girl school that recently began admitting male students. Now surrounded by all girls, he begins to realize that all members of this high school possess special powers, including himself. (Source: MangaHelpers)

Upon meeting the girl who would become her adopted younger sister, the duke’s daughter Christina regained memories of her previous life. Through those memories, she learned that her new sister, Mishuli, was the heroine of a certain story. And though the story depicted a Christina who abused her sister, the real Christina turned into a siscon who spoiled Mishuli to no end. Unfortunately, one day, Christina realized something. The best future for Mishuli depended on that story’s ending. And by following that story, whether it was execution, suicide, or exile, nothing fortunate would await Christina. Even knowing this, Christina would not waver. It was all for the sake of her sister. This is a story about a siscon girl who ignored her own destiny, to bring happiness to her sister.

An anthology of 20 short stories with the theme "15 cm between you and me" written by 20 different authors.